Fix docs generation, PSR-12 type compliance (#790)

* Correct docs generation, fixes #774

* Standardise on unaliased int and bool types, as per PSR-12 section 2.5

src/FFMpeg/Format/Video/DefaultVideo.php

@@ -49,7 +49,7 @@ abstract class DefaultVideo extends DefaultAudio implements VideoInterface
     /**
      * Sets the kiloBitrate value.
      *
-     * @param  integer                  $kiloBitrate
+     * @param  int                  $kiloBitrate
      * @throws InvalidArgumentException
      */
     public function setKiloBitrate($kiloBitrate)
@@ -93,7 +93,7 @@ abstract class DefaultVideo extends DefaultAudio implements VideoInterface
     }
 
     /**
-     * @return integer
+     * @return int
      */
     public function getModulus()
     {