scala: move text files from $out to appropriate subdirs

Before, this package installed files called LICENSE and NOTICE at the
profile root directory. Which conflicts with other packages with the
same issue. Those files reside now in $out/share/doc/scala/.

pkgs/development/compilers/scala/2.13.nix

···
     # put docs in correct subdirectory
     mkdir -p $out/share/doc
     mv $out/doc $out/share/doc/scala
+    mv $out/{LICENSE,NOTICE} $out/share/doc/scala
 
     for p in $(ls $out/bin/) ; do
       wrapProgram $out/bin/$p \