gnu: Fix various synopses.

* gnu/packages/emacs-xyz.scm (emacs-elfeed-goodies): Fix synopsis.
* gnu/packages/haskell-xyz.scm (ghc-should-not-typecheck): Fix synopsis.
* gnu/packages/rust-apps.scm (just): Fix synopsis.

Change-Id: I7060a55eff52526ab2985ba364e2b2b4976799ce
Signed-off-by: Vagrant Cascadian <vagrant@debian.org>

gnu/packages/emacs-xyz.scm

@@ -15662,7 +15662,7 @@ and RSS, with a user interface inspired by notmuch.")
         emacs-link-hint))
       (home-page "https://github.com/jeetelongname/elfeed-goodies")
       (synopsis
-       "Various bits and pieces to enhance the Elfeed user experience.")
+       "Various bits and pieces to enhance the Elfeed user experience")
       (description
        "This package enhances the vanilla Elfeed user experience with:
 @itemize @bullet

gnu/packages/haskell-xyz.scm

@@ -16591,7 +16591,7 @@ Lua tables, but are augmented with convenience functions.")
     (native-inputs (list ghc-hspec ghc-hspec-expectations))
     (home-page "https://github.com/CRogers/should-not-typecheck")
     (synopsis
-     "A HUnit/hspec assertion library to verify that an expression does not typecheck")
+     "HUnit/hspec assertion library to verify that an expression does not typecheck")
     (description
      "For examples and an introduction to the library please take a look at the
 <https://github.com/CRogers/should-not-typecheck#should-not-typecheck- README>

gnu/packages/rust-apps.scm

@@ -1611,7 +1611,7 @@ bar.  It is also compatible with sway.")
                        '()))
     (inputs (list bash-minimal coreutils-minimal))
     (home-page "https://github.com/casey/just")
-    (synopsis "Just a command runner")
+    (synopsis "Command runner")
     (description "This package provides @code{just}, a command runner.
 @code{just} is a handy way to save and run project-specific commands.")
     (license license:cc0)))