Rename UselessOverridingMethodSniff property and improve its docblock

Co-authored-by: Juliette <[email protected]>

Author: rodrigoprimo

src/Standards/Generic/Sniffs/CodeAnalysis/UselessOverridingMethodSniff.php

@@ -29,12 +29,11 @@ class UselessOverridingMethodSniff implements Sniff
 {
 
     /**
-     * List of class and trait tokens. Used to detect functions that
-     * are part of a class, anon class or trait.
+     * Object-Oriented scopes in which a call to parent::method() can exist.
      *
-     * @var array
+     * @var array<int|string, bool> Keys are the token constants, value is irrelevant.
      */
-    private $classAndTraitTokens = [
+    private $validOOScopes = [
         T_CLASS      => true,
         T_ANON_CLASS => true,
         T_TRAIT      => true,
@@ -76,7 +75,7 @@ public function process(File $phpcsFile, $stackPtr)
         $lastCondition = end($conditions);
 
         // Skip functions that are not a method part of a class, anon class or trait.
-        if (isset($this->classAndTraitTokens[$lastCondition]) === false) {
+        if (isset($this->validOOScopes[$lastCondition]) === false) {
             return;
         }