docs: update misplaced word in repo terminology (#35913)

Author: ashwingopalsamy

content/repositories/creating-and-managing-repositories/about-repositories.md

@@ -39,7 +39,7 @@ Fork | A new repository that shares code and visibility settings with the origin
 Merge | To take the changes from one branch and apply them to another.
 Pull request | A request to merge changes from one branch into another.
 Remote | A repository stored on {% data variables.product.product_name %}, not on your computer.
-Upstream | The branch on an original repository that has been forked or cloned. The corresponding branch on the cloned or forked branch is called the "downstream."
+Upstream | The branch on an original repository that has been forked or cloned. The corresponding branch on the cloned or forked repository is called the "downstream."
 
 {% endrowheaders %}