PHPDoc: Correct marker in one class header

Summary:
This is PHPDoc for a class header. Thus there is no `@param` to pass.
Phorge specific `@task info` was meant here. See other examples in classes.

Test Plan: Read and grep the code.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D25954

src/aphront/site/AphrontRoutingResult.php

@@ -3,7 +3,7 @@
 /**
  * Details about a routing map match for a path.
  *
- * @param info Result Information
+ * @task info Result Information
  */
 final class AphrontRoutingResult extends Phobject {