Mention "editorial changes"

Author: martinbonnin

CONTRIBUTING.md

@@ -6,8 +6,8 @@ contributions.
 
 Contributions that do not change the interpretation of the spec but instead
 improve legibility, fix editorial errors, clear up ambiguity and improve
-examples are encouraged and are often merged by a spec editor with little
-process.
+examples are encouraged. Those are often referred as "editorial changes" and
+merged by a spec editor with little process.
 
 However, contributions that _do_ meaningfully change the interpretation of the
 spec must follow an RFC (Request For Comments) process led by a _champion_