Add Yaml verifier

This patch adds Yaml verifier to the list of built-in verifiers. Yaml
verifier can be used on `file` like resources such as `file`, `template`
etc.

Signed-off-by: Antony Deepak Thomas <antonydeepak@gmail.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/docs/dev/design_documents/resource_file_content_verification.md b/docs/dev/design_documents/resource_file_content_verification.md
index f813e57c72..3df3083395 100644
--- a/docs/dev/design_documents/resource_file_content_verification.md
+++ b/docs/dev/design_documents/resource_file_content_verification.md
@@ -81,15 +81,20 @@ template "/etc/nginx.conf" do
 end
 ```
 
-Chef may ship built-in verifiers for common checks, such as
-content-type verification. Built-in verifiers can be used by passing
-well-known symbols to the verify attribute:
+Chef ships built-in verifiers for common content-types such as
+`:systemd_unit`, `:yaml` and `:json`. Built-in verifiers can be
+used by passing well-known symbols to the verify attribute:
 
 ```ruby
 template "/etc/config.json" do
   verify :json
 end
 ```
+```ruby
+template "/etc/config.yaml" do
+  verify :yaml
+end
+```
 
 ## Motivation