Fixed a typo

Fixed a typo

Author: SehrishHussain

src/user/ci-skeleton.rst

@@ -167,7 +167,7 @@ Just run the following commands:
 
 3. Register with the CI providers
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-This is important!  It you haven't done so already, you'll need to go
+This is important!  If you haven't done so already, you'll need to go
 to the CI providers (Travis, Circle, Azure, etc.) and enable CI
 to for your repository. Each CI provider that you use will have
 documentation on how to get set up with them.