Add docs to all the jobs

Change-Id: I621c38a39f637b6843b9754f45fecaf415a22af2
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 26bc4e6..b3f6cbc 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -3,4 +3,4 @@
     pre-run: playbooks/web-ext-lint/pre.yaml
     run: playbooks/web-ext-lint/run.yaml
     post-run: playbooks/web-ext-lint/post.yaml
-    description: Check a Web Extension project for basic lint problems.
+    description: ".. include:: ../playbooks/web-ext-lint/README.rst"