docs: code_reviews: fix list style

Bug: None
Change-Id: Ib1079c2c37ba772ac3c9a73927c24ecf0cf19d98
Reviewed-on: https://chromium-review.googlesource.com/1058699Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558645}

docs/code_reviews.md

@@ -33,7 +33,7 @@ Please also read [Respectful Changes](cl_respect.md) and
     request more time, or suggest another reviewer.
 
   * Use the status field in Gerrit settings to indicate if you're away and when
-  * you'll be back.
+    you'll be back.
 
   * Don't generally discourage people from sending you code reviews. This
     includes using a blanket "slow" in your status field.