Merge pull request #979 from soxofaan/repo-local

Add some cross-references related to repo-local hooks

Author: asottile

sections/advanced.md

@@ -299,7 +299,7 @@ You can configure repository-local hooks by specifying the [`repo`](#repos-repo)
 sentinel `local`.
 
 local hooks can use any language which supports [`additional_dependencies`](#config-additional_dependencies)
-or `docker_image` / `fail` / `pygrep` / `script` / `system`.
+or [`docker_image`](#docker_image) / [`fail`](#fail) / [`pygrep`](#pygrep) / [`script`](#script) / [`system`](#system).
 This enables you to install things which previously would require a trivial
 mirror repository.
 

sections/plugins.md

@@ -73,6 +73,9 @@ from.
 =r=
     =c= [`repo`](_#repos-repo)
     =c= the repository url to `git clone` from
+        or one of the special sentinel values:
+        [`local`](#repository-local-hooks),
+        [`meta`](#meta-hooks).
 =r=
     =c= [`rev`](_#repos-rev)
     =c= the revision or tag to clone at.