📚 Update doc

Author: Vincent Langlet

docs/standards.md

@@ -33,7 +33,6 @@ We mainly respect the [Symfony Standard](./symfony.md) but
 - We do not currently check these rules:
 
   - Always use identical comparison unless you need type juggling
-  - Use Yoda conditions when checking a variable against an expression
   - Exception and error message strings must be concatenated using `sprintf`
   - Calls to `trigger_error` with type `E_USER_DEPRECATED` must be switched to opt-in via `@`operator
   - Do not use `else`, `elseif`, `break` after `if` and `case` conditions which return or throw something

docs/standards/symfony.md

@@ -36,7 +36,9 @@ Not covered
 
 - Use Yoda conditions when checking a variable against an expression
 
-Not covered
+```
+<rule ref="Symfony3Custom.Formatting.YodaCondition" />
+```
 
 - Add a comma after each array item in a multi-line array, even after the last one