minor symfony#16673 AssetBundle - fix docs (eventhorizonpl)

This PR was submitted for the 2.8 branch but it was merged into the 2.7 branch instead (closes symfony#16673).

Discussion
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AssetBundle - fix docs

Hi,

This PR updates some docs in Asset Bundle.

Best regards,
Michal

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Commits
-------

62b3cb2 AssetBundle - fix docs

Author: fabpot

src/Symfony/Component/Asset/Package.php

@@ -60,6 +60,9 @@ protected function getContext()
         return $this->context;
     }
 
+    /**
+     * @return VersionStrategyInterface
+     */
     protected function getVersionStrategy()
     {
         return $this->versionStrategy;

src/Symfony/Component/Asset/VersionStrategy/StaticVersionStrategy.php

@@ -21,6 +21,10 @@ class StaticVersionStrategy implements VersionStrategyInterface
     private $version;
     private $format;
 
+    /**
+     * @param string $version Version number
+     * @param string $format  Url format
+     */
     public function __construct($version, $format = null)
     {
         $this->version = $version;