Fix case used for GitHub

lib/cocoapods/command/spec.rb

@@ -432,7 +432,7 @@ module Pod
 
       #--------------------------------------#
 
-      # Templates and github information retrieval for spec create
+      # Templates and GitHub information retrieval for spec create
       #
       # @todo It would be nice to have a template class that accepts options
       #       and uses the default ones if not provided.

lib/cocoapods/user_interface/error_report.rb

@@ -51,7 +51,7 @@ Repositories : #{repo_information.join("\n               ")}
 
 #{'[!] Oh no, an error occurred.'.red}
 #{error_from_podfile(exception)}
-#{'Search for existing github issues similar to yours:'.yellow}
+#{'Search for existing GitHub issues similar to yours:'.yellow}
 #{issues_url(exception)}
 
 #{'If none exists, create a ticket, with the template displayed above, on:'.yellow}