Update contributing-to-a-project.md

Linter error

content/get-started/exploring-projects-on-github/contributing-to-a-project.md

@@ -162,7 +162,7 @@ When you stage and commit files, you essentially tell Git, "Okay, take a snapsho
 
 Right now, your changes only exist locally. When you're ready to push your changes up to {% data variables.product.product_name %}, push your changes to the remote.
 
-To do that first switch to the feature branch (the branch you want to merge) if you are not. After checking that all the changes are committed, execute the following command. 
+To do that first switch to the feature branch (the branch you want to merge) if you are not. After checking that all the changes are committed, execute the following command.
 (-u short for --set-upstream)
 
 {% webui %}