Add __toString() methods for Description and Tag

And let the Serializer make use of the (string) $tag

src/phpDocumentor/Reflection/DocBlock/Description.php

@@ -209,14 +209,12 @@ class Description implements \Reflector
     }
 
     /**
-     * Returns the exported information (we should use the export static method
-     * BUT this throws an exception at this point).
+     * Returns the long description as a string.
      *
      * @return string
-     * @codeCoverageIgnore Not yet implemented
      */
     public function __toString()
     {
-        return 'Not yet implemented';
+        return $this->getContents();
     }
 }

src/phpDocumentor/Reflection/DocBlock/Serializer.php

@@ -182,7 +182,7 @@ class Serializer
 
         /** @var Tag $tag */
         foreach ($docblock->getTags() as $tag) {
-            $tagText = "@{$tag->getName()} {$tag->getContent()}";
+            $tagText = (string) $tag;
             if ($this->lineLength) {
                 $tagText = wordwrap($tagText, $wrapLength);
             }

src/phpDocumentor/Reflection/DocBlock/Tag.php

@@ -366,14 +366,12 @@ class Tag implements \Reflector
     }
 
     /**
-     * Returns the exported information (we should use the export static method
-     * BUT this throws an exception at this point).
+     * Returns the tag as a serialized string
      *
      * @return string
-     * @codeCoverageIgnore Not yet implemented
      */
     public function __toString()
     {
-        return 'Not yet implemented';
+        return "@{$this->getName()} {$this->getContent()}";
     }
 }