docs: upgrade docs to not use legacy set (#9282)

Author: keradus

doc/config.rst

@@ -43,7 +43,7 @@ The simplest config declares paths under control and rules to apply/check:
     return (new PhpCsFixer\Config())
         ->setRules([
             '@PER-CS' => true,
-            '@PHP82Migration' => true,
+            '@PHP8x2Migration' => true,
         ])
         ->setFinder($finder)
     ;

tests/Fixer/LanguageConstruct/ClassKeywordRemoveFixerTest.php

@@ -319,7 +319,7 @@ public function c() {
     /**
      * @requires PHP <8.0
      */
-    public function testFixPrePHP80(): void
+    public function testFixPrePHP8x0(): void
     {
         $this->doTest(
             "<?php echo 'DateTime'

tests/RuleSet/AbstractMigrationSetDefinitionTest.php

@@ -68,7 +68,7 @@ public function testGetDescriptionForPhpUnitMigrationSet(): void
         $set = new class extends AbstractMigrationSetDefinition {
             public function getName(): string
             {
-                return '@PHPUnit30Migration';
+                return '@PHPUnit3x0Migration';
             }
 
             public function getRules(): array

tests/Tokenizer/Analyzer/RangeAnalyzerTest.php

@@ -85,7 +85,7 @@ public static function provideRangeEqualsRangeCases(): iterable
     /**
      * @requires PHP <8.0
      */
-    public function testFixPrePHP80(): void
+    public function testFixPrePHP8x0(): void
     {
         $code = '<?php
             $a = [1,2,3];