gnu: Fix ‘this packages’ and some other niggles.

* gnu/packages/crates-io.scm (rust-home-0.5)[description]:
Fix ‘this packages’ typo.
* gnu/packages/emacs-xyz.scm (emacs-ahg, emacs-cwl-mode)[description]:
Likewise.
* gnu/packages/python-check.scm (python-pytest-csv)[description]:
Likewise.
* gnu/packages/ocaml.scm (ocaml-syntax-shims)[description]: Likewise,
and note which language.
* gnu/packages/python-xyz.scm (python-recommonmark)[description]:
Likewise, and work around ‘enabling you’.

gnu/packages/crates-io.scm

@@ -20512,7 +20512,7 @@ IEEE 754-2008 binary16 type.")
        (("rust-winapi" ,rust-winapi-0.3))))
     (home-page "https://github.com/brson/home")
     (synopsis "Shared definitions of home directories")
-    (description "This packages provides the definition of @code{home_dir}
+    (description "This package provides the definition of @code{home_dir}
 used by @command{cargo} and @command{rustup}, as well as functions to find the
 correct value of @samp{CARGO_HOME} and @samp{RUSTUP_HOME}.")
     (license (list license:expat license:asl2.0))))

gnu/packages/emacs-xyz.scm

@@ -1722,7 +1722,7 @@ directly.")
       (home-page "https://bitbucket.org/agriggio/ahg")
       (synopsis "Emacs front-end for the Mercurial SCM")
       (description
-       "This packages provides a simple Emacs front-end for the Mercurial
+       "This package provides a simple Emacs front-end for the Mercurial
 Distributed @acronym{Source Control Management, SCM} system.")
       (license license:gpl3+))))
 
@@ -29509,7 +29509,7 @@ shorter than usual, using mostly unprefixed keys.")
      `(("emacs-yaml-mode" ,emacs-yaml-mode)))
     (home-page "https://github.com/tom-tan/cwl-mode")
     (synopsis "Emacs mode for @acronym{CWL, Common Workflow Language} files")
-    (description "This packages provides a major mode for editing
+    (description "This package provides a major mode for editing
 @acronym{CWL, Common Workflow Language} files.")
     (license license:gpl3+)))
 

gnu/packages/ocaml.scm

@@ -7262,8 +7262,8 @@ these missing pieces.")
     (synopsis
      "Backport new syntax to older OCaml versions")
     (description
-     "This packages backports new features of the language to older
-compilers, such as let+.")
+     "This package backports new language features such as @code{let+} to older
+OCaml compilers.")
     (license license:expat)))
 
 (define-public ocaml-angstrom

gnu/packages/python-check.scm

@@ -120,7 +120,7 @@ interfaces with pytest.")
        ("python-six" ,python-six)))
     (home-page "https://github.com/nicoulaj/pytest-csv")
     (synopsis "CSV reporter for Pytest")
-    (description "This packages provides a plugin for Pytest that enables a
+    (description "This package provides a plugin for Pytest that enables a
 CSV output mode for Pytest.  It can be enabled via the @option{--csv} option
 it adds to the Pytest command line interface (CLI).")
     (license license:gpl3+)))

gnu/packages/python-xyz.scm

@@ -27044,8 +27044,8 @@ result.")
     (home-page "https://github.com/readthedocs/recommonmark")
     (synopsis "Docutils-compatibility bridge to CommonMark")
     (description
-     "This packages provides a docutils-compatibility bridge to CommonMark,
-enabling you to write CommonMark inside of Docutils & Sphinx projects.")
+     "This package provides a docutils-compatibility bridge to CommonMark that
+lets you write CommonMark inside of Docutils & Sphinx projects.")
     (license license:expat)))
 
 (define-public python-pyhull

gnu/packages/web.scm

@@ -807,7 +807,7 @@ programming language.")))
                  ;; The nginx source code is part of the module’s source.
                  (format #t "decompressing nginx source code~%")
                  (invoke "tar" "xvf" (assoc-ref inputs "nginx-sources")
-                         ;; This packages's LICENSE file would be
+                         ;; This package's LICENSE file would be
                          ;; overwritten with the one from nginx when
                          ;; unpacking the nginx source, so rename the nginx
                          ;; one when unpacking.