Apply suggestions from code review

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

Author: rodrigoprimo

src/Config.php

@@ -204,8 +204,8 @@ class Config
      * - Keys: lowercase version of the generator name.
      * - Values: name of the generator PHP class.
      *
-     * Note: once support for PHP < 5.6 is dropped, this property should be refactored into a class
-     * constant.
+     * {@internal Once support for PHP < 5.6 is dropped, this property should be refactored into a class
+     * constant.}
      *
      * @var array<string, string>
      */
@@ -1256,7 +1256,7 @@ public function processLongArgument($arg, $pos)
                 if (isset(self::$validGenerators[$lowerCaseGeneratorName]) === false) {
                     $validOptions = implode(', ', array_values(self::$validGenerators));
                     $error        = sprintf(
-                        'ERROR: "%s" is not a valid generator. Valid options are: %s.'.PHP_EOL.PHP_EOL,
+                        'ERROR: "%s" is not a valid generator. The following generators are supported: %s.'.PHP_EOL.PHP_EOL,
                         $generatorName,
                         $validOptions
                     );

tests/Core/Config/GeneratorArgTest.php

@@ -23,7 +23,7 @@ final class GeneratorArgTest extends TestCase
     /**
      * Ensure that the generator property is set when the parameter is passed a valid value.
      *
-     * @param string $argumentValue         Generator name passed in the command line.
+     * @param string $argumentValue         Generator name passed on the command line.
      * @param string $expectedPropertyValue Expected value of the generator property.
      *
      * @dataProvider dataValidGeneratorNames