gnu: packages: Fix typos.

* gnu/packages/emacs-xyz (emacs-litable)[description]: Fix use of singular
  form of "This package".
  (emacs-ssh-config-mode)[description]: Likewise.
* gnu/packages/haskell-xyz (ghc-process-extras)[description]: Likewise.
* gnu/packages/lisp (sbcl-fare-quasiquote-readtable)[description]: Likewise.
* gnu/packages/usb-modeswitch (usb-modeswitch-data)[description]: Likewise.

gnu/packages/emacs-xyz.scm

@@ -2704,7 +2704,7 @@ in Lisp modes.")
        `(("emacs-dash" ,emacs-dash)))
       (home-page "https://github.com/Fuco1/litable/")
       (synopsis "Dynamic evaluation replacement with Emacs")
-      (description "This packages provides dynamic evaluation in Emacs.")
+      (description "This package provides dynamic evaluation in Emacs.")
       (license license:gpl3+))))
 
 (define-public emacs-string-inflection
@@ -18337,7 +18337,7 @@ JIRA issue servers.")
       (synopsis
        "Mode for fontification of ~/.ssh/config")
       (description
-       "This packages fontifies the ssh config keywords and creates
+       "This package fontifies the ssh config keywords and creates
 keybindings for skipping from host section to host section.")
       (license license:gpl3+))))
 

gnu/packages/haskell-xyz.scm

@@ -7801,7 +7801,7 @@ examination.")
        ("ghc-listlike" ,ghc-listlike)))
     (home-page "https://github.com/seereason/process-extras")
     (synopsis "Extra tools for managing processes")
-    (description "This packages extends
+    (description "This package extends
 @url{http://hackage.haskell.org/package/process}.  It allows you to read
 process input and output as ByteStrings or Text, or write your own
 ProcessOutput instance.  It also provides lazy process input and output,

gnu/packages/lisp.scm

@@ -6474,7 +6474,7 @@ Trivia.")
 quasiquote is enable matching of quasiquoted patterns, using Optima or
 Trivia.
 
-This packages uses fare-quasiquote with named-readtable.")))
+This package uses fare-quasiquote with named-readtable.")))
 
 (define-public sbcl-trivia.level0
   (let ((commit "902e0c65602bbfe96ae82e679330b3771ddc7603")

gnu/packages/usb-modeswitch.scm

@@ -69,7 +69,7 @@
            (install-file (string-append files "/COPYING") license-dir)))))
     (home-page "http://www.draisberghof.de/usb_modeswitch/")
     (synopsis "Data package for USB_ModeSwitch")
-    (description "This packages contains data about devices and a UDEV rules
+    (description "This package contains data about devices and a UDEV rules
 file for use with USB_ModeSwitch.")
     (license license:gpl2+)))