Update JavaBodyParsers.md

Hi,
public static Result save() {
  RequestBody body = request().body();
  String textBody = body.asText();
  
  if(textBody != null) {
    ok("Got: " + text);
  } else {
    badRequest("Expecting text/plain request body");
  }
}

in this code, text should be textBody as text is not declared.
second thing no returns are added before ok() and badRequest()
So please merge these changes.
thanks