[LangRef] Remove extra commas of llvm.vp.ctlz (#117542)

Author: LiqinWeng

llvm/docs/LangRef.rst

@@ -25291,7 +25291,7 @@ Examples:
 
 .. code-block:: llvm
 
-      %r = call <4 x i32> @llvm.vp.ctlz.v4i32(<4 x i32> %a, , i1 false, <4 x i1> %mask, i32 %evl)
+      %r = call <4 x i32> @llvm.vp.ctlz.v4i32(<4 x i32> %a, i1 false, <4 x i1> %mask, i32 %evl)
       ;; For all lanes below %evl, %r is lane-wise equivalent to %also.r
 
       %t = call <4 x i32> @llvm.ctlz.v4i32(<4 x i32> %a, i1 false)