Fix doc blocks

src/FFMpeg/Filters/Video/SynchronizeFilter.php

@@ -14,8 +14,14 @@ namespace FFMpeg\Filters\Video;
 use FFMpeg\Format\VideoInterface;
 use FFMpeg\Media\Video;
 
+/**
+ * Synchronizes audio and video in case of desynchronized movies.
+ */
 class SynchronizeFilter implements VideoFilterInterface
 {
+    /**
+     * {@inheritdoc}
+     */
     public function apply(Video $video, VideoInterface $format)
     {
         $streams = $video->getStreams();

src/FFMpeg/Filters/Video/VideoFilters.php

@@ -25,7 +25,7 @@ class VideoFilters
     }
 
     /**
-     * Resizes a video to a given dimension
+     * Resizes a video to a given dimension.
      *
      * @param Dimension $dimension
      * @param string    $mode

src/FFMpeg/Filters/Video/VideoResampleFilter.php

@@ -27,7 +27,7 @@ class VideoResampleFilter implements VideoFilterInterface
     }
 
     /**
-     * Returns the frame rate
+     * Returns the frame rate.
      *
      * @return FrameRate
      */
@@ -37,7 +37,7 @@ class VideoResampleFilter implements VideoFilterInterface
     }
 
     /**
-     * Returns the GOP size
+     * Returns the GOP size.
      *
      * @see https://wikipedia.org/wiki/Group_of_pictures
      *