minor #32281 [DependencyInjection] Annotated correct return type for …

…getInEdges()/getOutEdges() (derrabus)

This PR was merged into the 3.4 branch.

Discussion
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[DependencyInjection] Annotated correct return type for getInEdges()/getOutEdges()

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

This changed annotation was quite helpful when analyzing `PhpDumper` for #32266.

Commits
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28882f5 Annotated correct return type for getInEdges()/getOutEdges().

src/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php

@@ -81,7 +81,7 @@ public function getId()
     /**
      * Returns the in edges.
      *
-     * @return array The in ServiceReferenceGraphEdge array
+     * @return ServiceReferenceGraphEdge[]
      */
     public function getInEdges()
     {
@@ -91,7 +91,7 @@ public function getInEdges()
     /**
      * Returns the out edges.
      *
-     * @return array The out ServiceReferenceGraphEdge array
+     * @return ServiceReferenceGraphEdge[]
      */
     public function getOutEdges()
     {