fix typo

fix typo

Author: KennethKinLum

book/A-git-in-other-environments/sections/visualstudiocode.asc

@@ -15,7 +15,7 @@ The main features are:
 ** Push/pull/sync with a remote branch.
 ** Resolve merge conflicts.
 ** View diffs.
-* With a extension, you can also handle GitHub Pull Requests:
+* With an extension, you can also handle GitHub Pull Requests:
   https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github[]
 
 The official documentation can be found here: https://code.visualstudio.com/Docs/editor/versioncontrol[]