glsl2: fix comments

src/glsl/ir_if_simplification.cpp

@@ -22,7 +22,7 @@
  */
 
 /**
- * \file ir_function_inlining.cpp
+ * \file ir_if_simplification.cpp
  *
  * Moves constant branches of if statements out to the surrounding
  * instruction stream.

src/glsl/ir_lower_jumps.cpp

@@ -22,7 +22,7 @@
  */
 
 /**
- * \file ir_remove_loop_jumps.cpp
+ * \file ir_lower_jumps.cpp
  */
 
 #include "glsl_types.h"

src/glsl/ir_mod_to_fract.cpp

@@ -22,7 +22,7 @@
  */
 
 /**
- * \file ir_mod_to_floor.cpp
+ * \file ir_mod_to_fract.cpp
  *
  * Breaks an ir_unop_mod expression down to (op1 * fract(op0 / op1))
  *