user YARD for doc, if you want doc something...

Signed-off-by: Lukáš Pokorný <lukas.pokorny@easysoftware.cz>

DEV/CODE_STYLE.md

@@ -64,7 +64,7 @@ Comments are required on complex code. Otherwise you should write _self-labeling
 ```ruby
 # BAD
 def convert_date(project, issue, user, date, **options)
-  ...
+  # ...
 end
 
 # GOOD
@@ -73,6 +73,8 @@ def render_user_name(user)
 end
 ```
 
+In general, comments are welcome. Please use [YARD](https://yardoc.org) docs style only. 
+
 **Quotes**
 
 On Ruby single quotes is preferred.