minor #20801 Update micro_kernel_trait.rst (lmlsna)

This PR was merged into the 7.2 branch.

Discussion
----------

Update micro_kernel_trait.rst

Yielded classes in registerBundles() function example code require "new" keyword to work.

Also removed getLogDir() and getCacheDir() functions in example code (these functions are already defined in an identical way by the parent class).

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/releases for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `7.x` for features of unreleased versions).

-->

Commits
-------

78eaf0d Update micro_kernel_trait.rst

Author: javiereguiluz

configuration/micro_kernel_trait.rst

@@ -260,11 +260,11 @@ Now it looks like this::
 
         public function registerBundles(): iterable
         {
-            yield FrameworkBundle();
-            yield TwigBundle();
+            yield new FrameworkBundle();
+            yield new TwigBundle();
 
             if ('dev' === $this->getEnvironment()) {
-                yield WebProfilerBundle();
+                yield new WebProfilerBundle();
             }
         }
 
@@ -305,18 +305,6 @@ Now it looks like this::
             // (use 'annotation' as the second argument if you define routes as annotations)
             $routes->import(__DIR__.'/Controller/', 'attribute');
         }
-
-        // optional, to use the standard Symfony cache directory
-        public function getCacheDir(): string
-        {
-            return __DIR__.'/../var/cache/'.$this->getEnvironment();
-        }
-
-        // optional, to use the standard Symfony logs directory
-        public function getLogDir(): string
-        {
-            return __DIR__.'/../var/log';
-        }
     }
 
 Before continuing, run this command to add support for the new dependencies: