Tests/FinallyTest: use named data sets

With non-named data sets, when a test fails, PHPUnit will display the number of the test which failed.

With tests which have a _lot_ of data sets, this makes it _interesting_ (and time-consuming) to debug those, as one now has to figure out which of the data sets in the data provider corresponds to that number.

Using named data sets makes debugging failing tests more straight forward as PHPUnit will display the data set name instead of the number.
Using named data sets also documents what exactly each data set is testing.

Includes making the data type in the docblock more specific.

Author: jrfnl

tests/Core/Tokenizer/FinallyTest.php

@@ -41,14 +41,14 @@ public function testFinallyKeyword($testMarker)
      *
      * @see testFinallyKeyword()
      *
-     * @return array
+     * @return array<string, array<string>>
      */
     public static function dataFinallyKeyword()
     {
         return [
-            ['/* testTryCatchFinally */'],
-            ['/* testTryFinallyCatch */'],
-            ['/* testTryFinally */'],
+            'finally after try and catch'   => ['/* testTryCatchFinally */'],
+            'finally between try and catch' => ['/* testTryFinallyCatch */'],
+            'finally after try, no catch'   => ['/* testTryFinally */'],
         ];
 
     }//end dataFinallyKeyword()
@@ -80,14 +80,14 @@ public function testFinallyNonKeyword($testMarker)
      *
      * @see testFinallyNonKeyword()
      *
-     * @return array
+     * @return array<string, array<string>>
      */
     public static function dataFinallyNonKeyword()
     {
         return [
-            ['/* testFinallyUsedAsClassConstantName */'],
-            ['/* testFinallyUsedAsMethodName */'],
-            ['/* testFinallyUsedAsPropertyName */'],
+            'finally used as class constant name' => ['/* testFinallyUsedAsClassConstantName */'],
+            'finally used as method name'         => ['/* testFinallyUsedAsMethodName */'],
+            'finally used as property name'       => ['/* testFinallyUsedAsPropertyName */'],
         ];
 
     }//end dataFinallyNonKeyword()