message: fix fmt call
diff: @@ -68,7 +68,7 @@ expose for downstream customers to use if they wish.
  .. note:: Axom patches all built-in TPLs to be under the `axom` namespace.
  This is to prevent symbol collisions with other projects, either our
  dependencies or downstream customers who wish their own versions. For
  - example, `fmt::format("foo")` is `axom::fmt("foo")`.
  + example, `fmt::format("foo")` is `axom::fmt::format("foo")`.
  They can be found in our repository here: `src/thirdparty`. The basic
  instructions on how to update a built-in TPL are as follows:
  