Fix comment op name

Fix op name in the comment

Signed-off-by: XYenChi <oriachiuan@gmail.com>

Author: XYenChi

riscv/insns/vfrsqrt7_v.h

@@ -1,4 +1,4 @@
-// vfclass.v vd, vs2, vm
+// vfrsqrt7.v vd, vs2, vm
 VI_VFP_V_LOOP
 ({
   vd = f16_rsqrte7(vs2);