message: Update api_def_RegexReplace.pbtxt
  Documentation issue fixed
diff: @@ -10,7 +10,7 @@ op {
  }
  in_arg {
  name: "rewrite"
  - description: "The rewrite to be applied to the matched expresion."
  + description: "The rewrite to be applied to the matched expression."
  }
  out_arg {
  name: "output"
  