Apply suggestions from code review

data/tutorials/guides/1wf_01_debugging.md

@@ -161,14 +161,14 @@ purpose formats are more suited to get the relevant information, than what can
 be output automatically by the generic pretty-printer used by the trace
 mechanism.
 
-Compiler builtins improve debugging messages. The location of the error in the program can be displayed. 
+Compiler builtins help display useful debugging messages. They indicate a location in the program's source. 
 For example,
 ```ocaml
 match Message.unpack response with
 | Some y -> y
 | None -> (Printf.eprintf "Invalid message at %s" __LOC__; raise Invalid_argument)
 ```
-At compile time, the `__LOC__` builtin is substituted with its location in the program, described as a string `"File %S, line %d, characters %d-%d"`. One can also get the file name, line number, start character and end character directly through the `__POS__` builtin:
+At compile time, the `__LOC__` builtin is substituted with its location in the program, described as a string `"File %S, line %d, characters %d-%d"`. File name, line number, start character and end character are also available through the `__POS__` builtin:
 ```ocaml
 match Message.unpack response with
 | Some y -> y