Fix descriptions to be CONTRIBUTIONS.md compliant

pkgs/development/ocaml-modules/janestreet/ppx-assert.nix

···
       ppx_type_conv sexplib ];
 
   meta = with stdenv.lib; {
-    description = "Assert-like extension nodes that raise useful errors on failure.";
+    description = "Assert-like extension nodes that raise useful errors on failure";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-bench.nix

···
   propagatedBuildInputs = [ ppx_core ppx_driver ppx_inline_test ppx_tools ];
 
   meta = with stdenv.lib; {
-    description = "Syntax extension for writing in-line benchmarks in ocaml code.";
+    description = "Syntax extension for writing in-line benchmarks in ocaml code";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-compare.nix

···
     [ppx_core ppx_driver ppx_tools ppx_type_conv ];
 
   meta = with stdenv.lib; {
-    description = "Generation of fast comparison functions from type expressions and definitions.";
+    description = "Generation of fast comparison functions from type expressions and definitions";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-custom-printf.nix

···
   propagatedBuildInputs = [ ppx_core ppx_driver ppx_sexp_conv ppx_tools ];
 
   meta = with stdenv.lib; {
-    description = "Extensions to printf-style format-strings for user-defined string conversion.";
+    description = "Extensions to printf-style format-strings for user-defined string conversion";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-driver.nix

···
     [ ppx_core ppx_optcomp ];
 
   meta = with stdenv.lib; {
-    description = "A driver is an executable created from a set of OCaml AST transformers linked together with a command line frontend.";
+    description = "A driver is an executable created from a set of OCaml AST transformers linked together with a command line frontend";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-enumerate.nix

···
   propagatedBuildInputs = [ ppx_core ppx_tools ppx_type_conv ];
 
   meta = with stdenv.lib; {
-    description = "Generate a list containing all values of a finite type.";
+    description = "Generate a list containing all values of a finite type";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-fail.nix

···
   propagatedBuildInputs = [ ppx_core ppx_driver ppx_here ppx_tools ];
 
   meta = with stdenv.lib; {
-    description = "Syntax extension that makes failwith include a position.";
+    description = "Syntax extension that makes failwith include a position";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-fields-conv.nix

···
   propagatedBuildInputs = [ ppx_core ppx_tools ppx_type_conv ];
 
   meta = with stdenv.lib; {
-    description = "Generation of accessor and iteration functions for ocaml records.";
+    description = "Generation of accessor and iteration functions for ocaml records";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-here.nix

···
   propagatedBuildInputs = [ ppx_core ppx_driver ];
 
   meta = with stdenv.lib; {
-    description = "A ppx rewriter that defines an extension node whose value is its source position.";
+    description = "A ppx rewriter that defines an extension node whose value is its source position";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-inline-test.nix

···
   propagatedBuildInputs = [ ppx_core ppx_driver ppx_tools ];
 
   meta = with stdenv.lib; {
-    description = "Syntax extension for writing in-line tests in ocaml code.";
+    description = "Syntax extension for writing in-line tests in ocaml code";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-jane.nix

···
       ppx_sexp_message ppx_sexp_value ppx_typerep_conv ppx_variants_conv ];
 
   meta = with stdenv.lib; {
-    description = "ppx_jane is a ppx_driver including all standard ppx rewriters.";
+    description = "A ppx_driver including all standard ppx rewriters";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-sexp-conv.nix

···
   propagatedBuildInputs = [ ppx_core ppx_tools ppx_type_conv sexplib];
 
   meta = with stdenv.lib; {
-    description = "A ppx rewriter that defines an extension node whose value is its source position.";
+    description = "A ppx rewriter that defines an extension node whose value is its source position";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-sexp-value.nix

···
   propagatedBuildInputs = [ ppx_core ppx_driver ppx_here ppx_sexp_conv ppx_tools ];
 
   meta = with stdenv.lib; {
-    description = "A ppx rewriter that simplifies building S-Expression from OCaml Values.";
+    description = "A ppx rewriter that simplifies building S-Expression from OCaml Values";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-type-conv.nix

···
     [ ppx_core ppx_deriving ppx_driver ppx_tools ];
 
   meta = with stdenv.lib; {
-    description = "The type_conv library factors out functionality needed by different preprocessors that generate code from type specifications.";
+    description = "The type_conv library factors out functionality needed by different preprocessors that generate code from type specifications";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };

pkgs/development/ocaml-modules/janestreet/ppx-variants-conv.nix

···
   propagatedBuildInputs = [ ppx_core ppx_tools ppx_type_conv sexplib];
 
   meta = with stdenv.lib; {
-    description = "Generation of accessor and iteration functions for ocaml variant types.";
+    description = "Generation of accessor and iteration functions for ocaml variant types";
     maintainers = [ maintainers.maurer ];
     license = licenses.asl20;
   };