gnu: go-github-com-rogpeppe-go-internal: Improve description.

* gnu/packages/golang-xyz.scm (go-github-com-rogpeppe-go-internal)
[description]: Fix fill column and adjust the wording a little.

Change-Id: I616d91e2dde2c0b7c76fc367f42bd6d6d977c56e

gnu/packages/golang-xyz.scm

@@ -14056,25 +14056,28 @@ strings.")
     (home-page "https://github.com/rogpeppe/go-internal/")
     (synopsis "Internal packages from the Go standard library")
     (description
-     "This repository factors out an opinionated selection of internal
+     "This package provides factors out an opinionated selection of internal
 packages and functionality from the Go standard library.  Currently this
 consists mostly of packages and testing code from within the Go tool
 implementation.
 
 Included are the following:
 @itemize
-@item dirhash: calculate hashes over directory trees the same way that the Go tool does.
+@item dirhash: calculate hashes over directory trees the same way that the Go
+tool does.
 @item goproxytest: a GOPROXY implementation designed for test use.
 @item gotooltest: Use the Go tool inside test scripts (see testscript below)
-@item imports: list of known architectures and OSs, and support for reading import import statements.
-@item modfile: read and write go.mod files while preserving formatting and comments.
+@item imports: list of known architectures and OSs, and support for reading
+import import statements.
+@item modfile: read and write go.mod files while preserving formatting and
+comments.
 @item module: module paths and versions.
 @item par: do work in parallel.
 @item semver: semantic version parsing.
 @item testenv: information on the current testing environment.
 @item testscript: script-based testing based on txtar files
 @item txtar: simple text-based file archives for testing.
-@end itemize\n")
+@end itemize")
     (license license:bsd-3)))
 
 (define-public go-github-com-rs-zerolog