re-phrase docblocks

src/UtmParameters.php

@@ -220,47 +220,47 @@ public function forget($response)
     }
 
     /**
-     * Get the source parameter
+     * Get the source parameter value
      */
     public function getSource() : string
     {
         return $this->source;
     }
 
     /**
-     * Get the medium parameter
+     * Get the medium parameter value
      */
     public function getMedium() : ?string
     {
         return $this->medium;
     }
 
     /**
-     * Get the campaign parameter
+     * Get the campaign parameter value
      */
     public function getCampaign() : ?string
     {
         return $this->campaign;
     }
 
     /**
-     * Get the term parameter
+     * Get the term parameter value
      */
     public function getTerm() : ?string
     {
         return $this->term;
     }
 
     /**
-     * Get the content parameter
+     * Get the content parameter value
      */
     public function getContent() : ?string
     {
         return $this->content;
     }
 
     /**
-     * Get all parameters as an array
+     * Get all parameters as a key => value array
      *
      * @return array<string,string|null>
      */