message: doc: fix a typo in the default settings discussion
  This change fixed a typo with the grammatical construct in the sentence.
diff: @@ -162,7 +162,7 @@ would like to only change the color scheme of the default `cmd` profile to
  }
  ```
  -Here, we're know we're changing the `cmd` profile, because the `guid`
  +Here, we know we're changing the `cmd` profile, because the `guid`
  `"{0caa0dad-35be-5f56-a8ff-afceeeaa6101}"` is `cmd`'s unique GUID. Any profiles
  with that GUID will all be treated as the same object. Any changes in that
  profile will overwrite those from the defaults.
  