Fix some doxygen syntax.

@param should not be used inside description, or it will break the rendering

(r1883196 in trunk)

git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.7.x@1883197 13f79535-47bb-0310-9956-ffa450edef68

include/apr_hash.h

@@ -256,7 +256,7 @@ typedef int (apr_hash_do_callback_fn_t)(void *rec, const void *key,
 
 /** 
  * Iterate over a hash table running the provided function once for every
- * element in the hash table. The @param comp function will be invoked for
+ * element in the hash table. The @p comp function will be invoked for
  * every element in the hash table.
  *
  * @param comp The function to run