glsl: Remove duplicate comment

Remove duplicate doxgen comment for
ir_function.cpp:parameter_lists_match().

Signed-off-by: Chad Versace <chad@chad-versace.us>

src/glsl/ir_function.cpp

@@ -30,14 +30,6 @@ typedef enum {
    PARAMETER_LIST_INEXACT_MATCH, /*< Match requires implicit conversion. */
 } parameter_list_match_t;
 
-/**
- * \brief Check if two parameter lists match.
- *
- * \param list_a Parameters of the function definition.
- * \param list_b Actual parameters passed to the function.
- * \see matching_signature()
- */
-
 /**
  * \brief Check if two parameter lists match.
  *