Merge branch 'eread/edit-lefthook-documentation' into 'master'

Edit Lefthook documentation

See merge request gitlab-org/gitlab!47256

doc/.vale/gitlab/spelling-exceptions.txt

@@ -232,6 +232,7 @@ Laravel
 LDAP
 ldapsearch
 Leiningen
+Lefthook
 Libravatar
 liveness
 Lograge

doc/development/contributing/style_guides.md

@@ -48,14 +48,16 @@ for changed files. This saves you time as you don't have to wait for the same er
 by CI/CD.
 
 Lefthook relies on a pre-push hook to prevent commits that violate its ruleset.
-If you wish to override this behavior, pass the environment variable `LEFTHOOK=0`.
-That is, `LEFTHOOK=0 git push`.
+To override this behavior, pass the environment variable `LEFTHOOK=0`. That is,
+`LEFTHOOK=0 git push`.
 
 You can also:
 
 - Define [local configuration](https://github.com/Arkweid/lefthook/blob/master/docs/full_guide.md#local-config).
-- Skip [checks per tag on the fly](https://github.com/Arkweid/lefthook/blob/master/docs/full_guide.md#skip-some-tags-on-the-fly), e.g. `LEFTHOOK_EXCLUDE=frontend git push origin`.
-- Run [hooks manually](https://github.com/Arkweid/lefthook/blob/master/docs/full_guide.md#run-githook-group-directly), e.g. `lefthook run pre-push`.
+- Skip [checks per tag on the fly](https://github.com/Arkweid/lefthook/blob/master/docs/full_guide.md#skip-some-tags-on-the-fly).
+  For example, `LEFTHOOK_EXCLUDE=frontend git push origin`.
+- Run [hooks manually](https://github.com/Arkweid/lefthook/blob/master/docs/full_guide.md#run-githook-group-directly).
+  For example, `lefthook run pre-push`.
 
 ## Ruby, Rails, RSpec