minor #12557 [Workflow] Fixed PHP config of workflow marking store (lyrixx)

This PR was merged into the 4.3 branch.

Discussion
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[Workflow] Fixed PHP config of workflow marking store

ref symfony/symfony#34092

Commits
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019d1f5 [Workflow] Fixed PHP config of workflow marking store

Author: javiereguiluz

workflow.rst

@@ -127,7 +127,7 @@ like this:
                     ],
                     'marking_store' => [
                         'type' => 'method'
-                        'property' => ['currentPlace']
+                        'property' => 'currentPlace'
                     ],
                     'supports' => ['App\Entity\BlogPost'],
                     'initial_marking' => 'draft',