MC-15575: Correct filter output

- fix static test failures

Author: Joan He

app/code/Magento/Email/Model/Template/Filter.php

@@ -321,6 +321,8 @@ public function setDesignParams(array $designParams)
     }
 
     /**
+     * Get Css processor
+     *
      * @deprecated 100.1.2
      * @return Css\Processor
      */
@@ -333,6 +335,8 @@ private function getCssProcessor()
     }
 
     /**
+     * Get pub directory
+     *
      * @deprecated 100.1.2
      * @param string $dirType
      * @return ReadInterface
@@ -523,6 +527,7 @@ public function mediaDirective($construction)
 
     /**
      * Retrieve store URL directive
+     *
      * Support url and direct_url properties
      *
      * @param string[] $construction
@@ -958,6 +963,8 @@ public function getCssFilesContent(array $files)
     }
 
     /**
+     * Apply inline css
+     *
      * Merge HTML and CSS and return HTML that has CSS styles applied "inline" to the HTML tags. This is necessary
      * in order to support all email clients.
      *