Generalize item about edition test annotations
In our authoring guide, we describe how to control the edition for a
test. This was written as though the only two editions were 2015 and
2018. Let's update the wording to make this more general.
diff --git a/docs/authoring.md b/docs/authoring.md
index 1c15848..996a0b1 100644
--- a/docs/authoring.md
+++ b/docs/authoring.md
@@ -47,7 +47,7 @@
Rust examples are tested via rustdoc, and should include the appropriate annotations:
-* `edition2015` or `edition2018` --- If it is edition-specific (see `book.toml` for the default).
+* `edition2015`, `edition2018`, etc. --- If it is edition-specific (see `book.toml` for the default).
* `no_run` --- The example should compile successfully, but should not be executed.
* `should_panic` --- The example should compile and run, but produce a panic.
* `compile_fail` --- The example is expected to fail to compile.
