Replace github by GitHub

This is how the GitHub people render the name.

Author: paultcochrane

lib/Language/modules.pod

@@ -13,15 +13,16 @@ directory|http://modules.perl6.org>. C<:)>
 For now, the process requires that you use git for your module's version
 control.
 
-The instructions herein require that you have a github account so that
-your module can be shared from its github repository.
+The instructions herein require that you have a
+L<GitHub|http://www.github.com> account so that your module can be shared
+from its GitHub repository.
 
 To share your module then, do the following:
 
     =item Create a project directory named after your module. For
     example, if your module is Vortex::TotalPerspective, then create a
     project directory named C<Vortex-TotalPerspective>. This project
-    directory name will also be used as the github repo name.
+    directory name will also be used as the GitHub repo name.
 
     =begin item
     Make your project directory look like this:
@@ -48,7 +49,7 @@ To share your module then, do the following:
     =end item
 
     =item The C<README.md> file is a markdown-formatted text file, which
-    will later be automatically rendered as html by github.
+    will later be automatically rendered as HTML by GitHub.
 
     =item Regarding the C<LICENSE> file, if you have no other preference,
     you might just use the same one that Rakudo Perl 6 uses. Just
@@ -99,13 +100,13 @@ To share your module then, do the following:
     =item Put your project under git version control if you haven't done so
     already.
 
-    =item Once you're happy with your project, create a repo for it at github.
-    See L<github's help docs|https://help.github.com/> if necessary. Your
-    github repo should be named the same as your project directory. Immediately
-    after creating the github repo, github shows you how to configure your
-    local repo to know about your github repo.
+    =item Once you're happy with your project, create a repo for it at GitHub.
+    See L<GitHub's help docs|https://help.github.com/> if necessary. Your
+    GitHub repo should be named the same as your project directory. Immediately
+    after creating the GitHub repo, GitHub shows you how to configure your
+    local repo to know about your GitHub repo.
 
-    =item Push your project to github.
+    =item Push your project to GitHub.
 
     =item Ping someone on IRC (#perl6 at freenode) to either show you how to
     add your module to the L<ecosystem|https://github.com/perl6/ecosystem>, or