[docs] Fix Markdown format missing `

Change-Id: I18846449fe0253f943725f9c2e141d1c7aead425
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/4260
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Dirk Pranke <[email protected]>
diff --git a/AUTHORS b/AUTHORS
index ca26671..fe152fd 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -25,6 +25,7 @@
 Gergely Nagy <[email protected]>
 Ilia K <[email protected]>
 Ivan Naydonov <[email protected]>
+Joe Armstrong <[email protected]>
 Julien Brianceau <[email protected]>
 Kal Conley <[email protected]>
 Kamil Rytarowski <[email protected]>