Moved "conditions" inside "structure".

Author: phansys

contributing/code/standards.rst

@@ -100,6 +100,9 @@ Structure
 
 * Place unary operators (``!``, ``--``, ...) adjacent to the affected variable;
 
+* Use `Yoda condition`_ when checking a variable against an expression to avoid
+  an accidental assignment inside the condition statement;
+
 * Add a comma after each array item in a multi-line array, even after the
   last one;
 
@@ -167,24 +170,6 @@ Service Naming Conventions
 
 * A group name uses the underscore notation.
 
-.. _contributing-code-standards-conditions:
-
-Conditions
-----------
-
-Use `Yoda condition`_ when checking a variable against a value to avoid an
-accidental assignment inside the condition statements::
-
-    // use
-    if ('some string' === $someVar && someFunction() === $otherVar) {
-        // ...
-    }
-
-    // instead of
-    if ($someVar === 'some string' && $otherVar === someFunction()) {
-        // ...
-    }
-
 Documentation
 -------------