minor #11067 [Stopwatch] Added return type to Stopwatch::getSections() (umpirsky)

This PR was merged into the 2.6-dev branch.

Discussion
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[Stopwatch] Added return type to Stopwatch::getSections()

https://github.com/symfony/symfony/pull/10851#discussion_r13479016

Commits
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ab00361 Added return type to Stopwatch::getSections()

src/Symfony/Component/Stopwatch/Stopwatch.php

@@ -33,6 +33,9 @@ class Stopwatch
         $this->sections = $this->activeSections = array('__root__' => new Section('__root__'));
     }
 
+    /**
+     * @return Section[]
+     */
     public function getSections()
     {
         return $this->sections;