Auto merge of #51439 - Voultapher:feature/fix-contributing-spelling-error, r=kennytm

Fix spelling error in CONTRIBUTING.md

Thought I'd start with something small.

Author: bors

CONTRIBUTING.md

@@ -48,7 +48,7 @@ always work, and sometimes it's hard to know what to search for, so consider thi
 extra credit. We won't mind if you accidentally file a duplicate report.
 
 Similarly, to help others who encountered the bug find your issue,
-consider filing an issue with with a descriptive title, which contains information that might be unique to it.
+consider filing an issue with a descriptive title, which contains information that might be unique to it.
 This can be the language or compiler feature used, the conditions that trigger the bug,
 or part of the error message if there is any.
 An example could be: **"impossible case reached" on lifetime inference for impl Trait in return position**.