Improve grammar

Author: Daniel Lange

downloads.haml

@@ -131,12 +131,12 @@
             Thanks to Christian Hesse.
           %li
             %b> MacOS
-            \: htop is included in the default Homebrew formulaes, you can install it with:
+            \: htop is included in the default Homebrew formulae, you can install it with:
             %tt
               brew install htop
             %br/
-            Thanks to
-            %a{:href => "https://github.com/Homebrew/homebrew-core/blame/master/Formula/h/htop.rb"} contributors
+            Thanks to the
+            %a{:href => "https://github.com/Homebrew/homebrew-core/blame/master/Formula/h/htop.rb"} homebrew contributors.
         %p
     %br/
     %br/