treewide: remove periods from end of package descriptions

pkgs/development/compilers/flutter/flutter.nix

···
   allowSubstitutes = false;
   passthru = { unwrapped = flutter; };
   meta = with stdenv.lib; {
-    description =
-      "Flutter is Google's SDK for building mobile, web and desktop with Dart.";
+    description = "Flutter is Google's SDK for building mobile, web and desktop with Dart";
     longDescription = ''
       Flutter is Google’s UI toolkit for building beautiful,
       natively compiled applications for mobile, web, and desktop from a single codebase.

pkgs/development/libraries/libfishsound/default.nix

···
 
   meta = with stdenv.lib; {
     homepage = "https://xiph.org/fishsound/";
-    description = ''libfishsound by itself is designed to handle raw codec streams from a lower level layer such as UDP datagrams. When these codecs are used in files, they are commonly encapsulated in Ogg to produce Ogg FLAC, Speex and Ogg Vorbis files.
+    description = "A simple programming interface for decoding and encoding audio data using Xiph.org codecs (FLAC, Speex and Vorbis)";
+    longDescription = ''libfishsound by itself is designed to handle raw codec streams from a lower level layer such as UDP datagrams. When these codecs are used in files, they are commonly encapsulated in Ogg to produce Ogg FLAC, Speex and Ogg Vorbis files.
 
 libfishsound is a wrapper around the existing codec libraries and provides a consistent, higher-level programming interface. It has been designed for use in a wide variety of applications; it has no direct dependencies on Ogg encapsulation, though it is most commonly used in conjunction with liboggz to decode or encode FLAC, Speex or Vorbis audio tracks in Ogg files, including Ogg Theora and Annodex.
 

pkgs/development/python-modules/yamale/default.nix

···
   ];
 
   meta = with lib; {
-    description = "A schema and validator for YAML.";
+    description = "A schema and validator for YAML";
     homepage = "https://github.com/23andMe/Yamale";
     license = licenses.mit;
     maintainers = with maintainers; [ rtburns-jpl ];

pkgs/development/tools/database/ephemeralpg/default.nix

···
     wrapProgram $out/bin/pg_tmp --prefix PATH : ${stdenv.lib.makeBinPath [ postgresql getopt ]}
   '';
   meta = with stdenv.lib; {
-    description = ''Run tests on an isolated, temporary PostgreSQL database.'';
+    description = "Run tests on an isolated, temporary PostgreSQL database";
     license = licenses.isc;
     homepage = "http://ephemeralpg.org/";
     platforms = platforms.all;

pkgs/games/pro-office-calculator/default.nix

···
   nativeBuildInputs = [ cmake ];
 
   meta = with stdenv.lib; {
-    description = "Just an ordinary calculator. Nothing to see here...";
+    description = "A completely normal office calculator";
     homepage = "https://proofficecalculator.com/";
     maintainers = [ maintainers.pmiddend ];
     platforms = platforms.linux;

pkgs/games/tes3cmd/default.nix

···
   '';
 
   meta = with lib; {
-    description = "A command line tool for examining and modifying plugins for the Elder Scrolls game Morrowind by Bethesda Softworks.";
+    description = "A command line tool for examining and modifying plugins for the Elder Scrolls game Morrowind by Bethesda Softworks";
     homepage = "https://github.com/john-moonsugar/tes3cmd";
     license = licenses.mit;
     maintainers = [ maintainers.marius851000 ];

pkgs/tools/admin/chamber/default.nix

···
 
   meta = with lib; {
     description =
-      "Chamber is a tool for managing secrets by storing them in AWS SSM Parameter Store.";
+      "A tool for managing secrets by storing them in AWS SSM Parameter Store";
     homepage = "https://github.com/segmentio/chamber";
     license = licenses.mit;
     maintainers = with maintainers; [ kalekseev ];

pkgs/tools/system/snooze/default.nix

···
   makeFlags = [ "DESTDIR=$(out)" "PREFIX=/" ];
 
   meta = with stdenv.lib; {
-    description =
-      "Tool for waiting until a particular time and then running a command.";
+    description = "Tool for waiting until a particular time and then running a command";
     maintainers = with maintainers; [ kaction ];
     license = licenses.cc0;
     platforms = platforms.linux;

pkgs/tools/system/thinkfan/default.nix

···
   '';
 
   meta = with stdenv.lib; {
-    description = "A minimalist fan control program. Originally designed
+    description  = "A minimalist fan control program";
+    longDescription = "A minimalist fan control program. Originally designed
 specifically for IBM/Lenovo Thinkpads, it now supports any kind of system via
 the sysfs hwmon interface (/sys/class/hwmon).";
     license = licenses.gpl3;