Remove by default in two-dot vs three-dot description (#51737)

Co-authored-by: Sarita Iyer <[email protected]>

content/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-comparing-branches-in-pull-requests.md

@@ -54,7 +54,7 @@ To simplify reviewing changes in a large pull request, you can filter the diff t
 
 ## Three-dot and two-dot Git diff comparisons
 
-There are two comparison methods for the `git diff` command; two-dot (`git diff A..B`) and three-dot (`git diff A...B`). By default, pull requests on {% data variables.product.prodname_dotcom %} show a three-dot diff.
+There are two comparison methods for the `git diff` command; two-dot (`git diff A..B`) and three-dot (`git diff A...B`). Pull requests on {% data variables.product.prodname_dotcom %} show a three-dot diff.
 
 ### Three-dot Git diff comparison