Fix typo of the half definition of fmin. (#1519)

Author: FinalEvilution

OpenCL_C.txt

@@ -5282,7 +5282,7 @@ ifdef::cl_khr_fp16[gentypeh *fmax*(gentypeh _x_, half _y_)]
   gentypef *fmin*(gentypef _x_, float _y_) +
   gentyped *fmin*(gentyped _x_, double _y_)
 
-ifdef::cl_khr_fp16[gentypeh *fmax*(gentypeh _x_, half _y_)]
+ifdef::cl_khr_fp16[gentypeh *fmin*(gentypeh _x_, half _y_)]
     | Returns _y_ if _y_ < _x_, otherwise it returns _x_.
       If one argument is a NaN, *fmin*() returns the other argument.
       If both arguments are NaNs, *fmin*() returns a NaN.