Revert "Minor typo"

puentesarrin · puentesarrin · commit ecabda9019ad · 2013-02-06T11:54:53.000-05:00
This reverts commit 3706a80.
diff --git a/source/tutorial/install-mongodb-on-os-x.txt b/source/tutorial/install-mongodb-on-os-x.txt
@@ -45,7 +45,7 @@ system installed, Homebrew is typically easier and simpler to use.
 Homebrew
 ~~~~~~~~
 
-Homebrew installs binary packages based on published "formula". Issue
+Homebrew installs binary packages based on published "formula." Issue
 the following command at the system shell to update the ``brew``
 package manager:
 
