gnu: Fix descriptions to not use quotes.

* gnu/packages/admin.scm (wpa-supplicant-minimal, mingetty, di),
* gnu/packages/audio.scm (fil-plugins),
* gnu/packages/base.scm (make-ld-wrapper, make-glibc-locales),
* gnu/packages/bioinformatics.scm (r-samtools),
* gnu/packages/chez.scm (chez-mit),
* gnu/packages/commencement.scm (make-gcc-toolchain),
* gnu/packages/compression.scm (fastjar),
* gnu/packages/cran.scm (r-maps, r-rcpp),
* gnu/packages/databases.scm (sparql-query),
* gnu/packages/dunst.scm (dunst),
* gnu/packages/ftp.scm (ncftp),
* gnu/packages/gl.scm (freeglut),
* gnu/packages/haskell-check.scm (ghc-tasty-golden),
* gnu/packages/haskell.scm (ghc-case-insensitive, ghc-text,
ghc-haskell-src, ghc-syb, ghc-deepseq-generics, ghc-network-uri,
ghc-rerebase, ghc-zlib),
* gnu/packages/image.scm (jbig2dec),
* gnu/packages/kde-frameworks.scm (kinit, karchive),
* gnu/packages/linux.scm (wireless-tools, perf, module-init-tools, kbd),
* gnu/packages/lirc.scm (lirc),
* gnu/packages/lisp.scm (uglify-js),
* gnu/packages/mate.scm (mate-netbook),
* gnu/packages/microcom.scm (microcom),
* gnu/packages/music.scm (bristol),
* gnu/packages/networking.scm (perl-geo-ip),
* gnu/packages/patchutils.scm (patches),
* gnu/packages/perl-check.scm (perl-test-more-utf8),
* gnu/packages/perl.scm (perl-log-report-optional, perl-file-which,
perl-io-tty, perl-log-any, perl-digest-sha1, perl-class-load,
perl-regexp-common, perl-module-pluggable, perl-class-modifier),
* gnu/packages/python-xyz.scm (python-backports-abc, python-natsort),
* gnu/packages/samba.scm (iniparser),
* gnu/packages/search.scm (mlocate),
* gnu/packages/spice.scm (spice),
* gnu/packages/statistics.scm (r-dt, r-lubridate, r-estimability,
r-commonmark, r-digest, r-viridislite, r-stringr),
* gnu/packages/tex.scm (texlive-latex-changebar),
* gnu/packages/version-control.scm (subversion),
* gnu/packages/w3m.scm (w3m),
* gnu/packages/web.scm (perl-http-parser,
perl-plack-middleware-reverseproxy),
* gnu/packages/xorg.scm (xkeyboard-config, mkfontdir, xcursor-theme,
mkfontscale, xinit, font-alias)[description]: Use @code instead of quotes.

gnu/packages/python-xyz.scm

@@ -5644,7 +5644,7 @@ It is written entirely in Python.")
     (synopsis "Backport of additions to the 'collections.abc' module")
     (description
      "Python-backports-abc provides a backport of additions to the
-'collections.abc' module in Python-3.5.")
+@code{collections.abc} module in Python-3.5.")
     (license license:psfl)))
 
 (define-public python2-backports-abc
@@ -10341,12 +10341,12 @@ Python to manipulate OpenDocument 1.2 files.")
     (description
      "Natsort lets you apply natural sorting on lists instead of
 lexicographical.  If you use the built-in @code{sorted} method in python
-on a list such as @code{['a20', 'a9', 'a1', 'a4', 'a10']}, it would be
-returned as @code{['a1', 'a10', 'a20', 'a4', 'a9']}.  Natsort provides a
-function @code{natsorted} that identifies numbers and sorts them separately
-from strings.  It can also sort version numbers, real numbers, mixed types
-and more, and comes with a shell command @command{natsort} that exposes this
-functionality in the command line.")
+on a list such as @code{[@code{a20}, @code{a9}, @code{a1}, @code{a4},
+@code{a10}]}, it would be returned as @code{[@code{a1}, @code{a10}, @code{a20},
+@code{a4}, @code{a9}]}.  Natsort provides a function @code{natsorted} that
+identifies numbers and sorts them separately from strings.  It can also sort
+version numbers, real numbers, mixed types and more, and comes with a shell
+command @command{natsort} that exposes this functionality in the command line.")
     (license license:expat)
     (properties `((python2-variant . ,(delay python2-natsort))))))