minor #18577 Fix operator to assign the route name micro_kernel_trait.rst (IssamRaouf)

This PR was submitted for the 6.4 branch but it was merged into the 6.2 branch instead.

Discussion
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Fix operator to assign the route name micro_kernel_trait.rst

The operator to assign the route name should be ':' instead of "="

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Commits
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818f0e1 Update micro_kernel_trait.rst

Author: javiereguiluz

configuration/micro_kernel_trait.rst

@@ -55,7 +55,7 @@ Next, create an ``index.php`` file that defines the kernel class and runs it:
                 ]);
             }
 
-            #[Route('/random/{limit}', name='random_number')]
+            #[Route('/random/{limit}', name:'random_number')]
             public function randomNumber(int $limit): JsonResponse
             {
                 return new JsonResponse([