share/doc/homebrew: fix capitalization.

Reference.
* GitHub: https://github.com/about
* Xcode: https://developer.apple.com/xcode
* Zsh: http://www.zsh.org

Closes #37866.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

3 files changed, 6 insertions, 6 deletions

diff --git a/share/doc/homebrew/Formula-Cookbook.md b/share/doc/homebrew/Formula-Cookbook.md
index dab0ad10f..5dc9ac03a 100644
--- a/share/doc/homebrew/Formula-Cookbook.md
+++ b/share/doc/homebrew/Formula-Cookbook.md
@@ -377,11 +377,11 @@ Now you just need to push back to GitHub.
 
 If you haven’t forked Homebrew yet, [go to the repo and hit the fork button](https://github.com/Homebrew/homebrew).
 
-If you have already forked Homebrew on Github, then you can manually push (just make sure you have been pulling from the Homebrew/homebrew master):
+If you have already forked Homebrew on GitHub, then you can manually push (just make sure you have been pulling from the Homebrew/homebrew master):
 
     git push git@github.com:myname/homebrew.git <what-you-called-your-branch>
 
-Now, please open a Pull Request (on your github repo page) for new and updated brews.
+Now, please open a Pull Request (on your GitHub repo page) for new and updated brews.
 
 *   One formula per commit; one commit per formula
 *   Keep merge commits out of the request
@@ -593,7 +593,7 @@ You can test if the "devel" spec is in use with `build.devel?`.
 
 ## Compiler selection
 
-Sometimes a package fails to build when using a certain compiler. Since recent XCode no longer includes a GCC compiler, we cannot simply force the use of GCC. Instead, the correct way to declare this is the `fails_with` DSL method. A properly constructed `fails_with` block documents the latest compiler build version known to cause compilation to fail, and the cause of the failure. For example:
+Sometimes a package fails to build when using a certain compiler. Since recent Xcode no longer includes a GCC compiler, we cannot simply force the use of GCC. Instead, the correct way to declare this is the `fails_with` DSL method. A properly constructed `fails_with` block documents the latest compiler build version known to cause compilation to fail, and the cause of the failure. For example:
 
 ```ruby
 fails_with :llvm do
diff --git a/share/doc/homebrew/Tips-N'-Tricks.md b/share/doc/homebrew/Tips-N'-Tricks.md
index 91f15a9f6..f6490377a 100644
--- a/share/doc/homebrew/Tips-N'-Tricks.md
+++ b/share/doc/homebrew/Tips-N'-Tricks.md
@@ -43,7 +43,7 @@ source `brew --repository`/Library/Contributions/brew_bash_completion.sh
 ```
 
 
-### ZSH
+### Zsh
 Run in terminal (may require `sudo`):
 
 ```zsh
diff --git a/share/doc/homebrew/brew-tap.md b/share/doc/homebrew/brew-tap.md
index 001f3a8e1..6404e5246 100644
--- a/share/doc/homebrew/brew-tap.md
+++ b/share/doc/homebrew/brew-tap.md
@@ -1,7 +1,7 @@
 # brew tap
 The `brew tap` command is powerful, but has a few subtleties worth describing.
 
-**tl;dr** `brew tap` allows you to add more Github repos to the list of formulae that `brew` tracks, updates and installs from. When naming tap repos and formulas, however, there are a few gotchas to beware of.
+**tl;dr** `brew tap` allows you to add more GitHub repos to the list of formulae that `brew` tracks, updates and installs from. When naming tap repos and formulas, however, there are a few gotchas to beware of.
 
 ## The command
 
@@ -27,7 +27,7 @@ telemachus/vim
 
 `brew tap username/repo` employs some shortcuts and has some limitations.
 
-*   On Github, your repository must be named `homebrew-something`.
+*   On GitHub, your repository must be named `homebrew-something`.
     The prefix 'homebrew-' is not optional.
 
 *   When you use `brew tap` on the command line, you can leave out the