semi-heading not needed adding much value

Author: tshepang

Diff for: src/conventions.md

@@ -80,9 +80,8 @@ in the rust-lang/rust repo, feel free to open a PR to remove it.
 Lines should be at most 100 characters. It's even better if you can
 keep things to 80.
 
-**Ignoring the line length limit.** Sometimes – in particular for
-tests – it can be necessary to exempt yourself from this limit. In
-that case, you can add a comment towards the top of the file like so:
+Sometimes, and particularly for tests, it can be necessary to exempt yourself from this limit.
+In that case, you can add a comment towards the top of the file like so:
 
 ```rust
 // ignore-tidy-linelength