Made the requested changes to all three files

content/github/getting-started-with-github/about-git-subtree-merges.md

@@ -12,6 +12,8 @@ versions:
   github-ae: '*'
 ---
 
+### About subtree merges
+
 Typically, a subtree merge is used to contain a repository within a repository. The "subrepository" is stored in a folder of the main repository.
 
 The best way to explain subtree merges is to show by example. We will:

content/github/getting-started-with-github/getting-changes-from-a-remote-repository.md

@@ -10,6 +10,8 @@ versions:
   enterprise-server: '*'
   github-ae: '*'
 ---
+### Options fpr gettting changes
+
 These commands are very useful when interacting with [a remote repository](/github/getting-started-with-github/about-remote-repositories). `clone` and `fetch` download remote code from a repository's remote URL to your local computer, `merge` is used to merge different people's work together with yours, and `pull` is a combination of `fetch` and `merge`.
 
 ### Cloning a repository

content/github/getting-started-with-github/using-git-rebase-on-the-command-line.md

@@ -11,6 +11,8 @@ versions:
   github-ae: '*'
 ---
 
+### Using Git rebase
+
 In this example, we will cover all of the `git rebase` commands available, except for `exec`.
 
 We'll start our rebase by entering `git rebase --interactive HEAD~7` on the terminal. Our favorite text editor will display the following lines: