Fixes rust-lang#924 Fixed line lengths.

Author: igaray

src/contributing.md

@@ -410,7 +410,8 @@ There are issues for beginners and advanced compiler devs alike!
 
 Just a few things to keep in mind:
 
-- Please limit line length to 100 characters. This is enforced by CI, and you can run the checks locally with `ci/check_line_lengths.sh`.
+- Please limit line length to 100 characters. This is enforced by CI, and you can run the checks
+  locally with `ci/check_line_lengths.sh`.
 - When contributing text to the guide, please contextualize the information with some time period
   and/or a reason so that the reader knows how much to trust or mistrust the information.
   Aim to provide a reasonable amount of context, possibly including but not limited to: