[Doc] Fix example in codegen doc.

The attributes in the example are placed wrong:
They belong after the type, not after the parameter name.

Reviewed by: abhina.sreeskantharajan

Differential Revision: https://reviews.llvm.org/D94683

llvm/docs/CodeGenerator.rst

@@ -2112,7 +2112,7 @@ Call as ``llc -tailcallopt test.ll``.
 
   define fastcc i32 @tailcaller(i32 %in1, i32 %in2) {
     %l1 = add i32 %in1, %in2
-    %tmp = tail call fastcc i32 @tailcallee(i32 %in1 inreg, i32 %in2 inreg, i32 %in1, i32 %l1)
+    %tmp = tail call fastcc i32 @tailcallee(i32 inreg %in1, i32 inreg %in2, i32 %in1, i32 %l1)
     ret i32 %tmp
   }