fix long line

Author: mark-i-m

src/about-this-guide.md

@@ -22,7 +22,8 @@ You might also find the following sites useful:
 
 - [Rustc API docs] -- rustdoc documentation for the compiler
 - [Forge] -- contains documentation about rust infrastructure, team procedures, and more
-- [compiler-team] -- the home-base for the rust compiler team, with description of the team procedures, active working groups, and the team calendar.
+- [compiler-team] -- the home-base for the rust compiler team, with description
+  of the team procedures, active working groups, and the team calendar.
 
 [GitHub repository]: https://github.com/rust-lang/rustc-guide/
 [Rustc API docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc/