Merge pull request #34007 from github/repo-sync

repo sync

Author: Octomerger

content/get-started/writing-on-github/working-with-advanced-formatting/attaching-files.md

@@ -41,7 +41,7 @@ We support these files:
 
 * PNG (*.png*)
 * GIF (*.gif*)
-* JPEG (*.jpg*)
+* JPEG (*.jpg*, *.jpeg*)
 {%- ifversion svg-support %}
 * SVG (*.svg*)
 {%- endif %}