Improve emoji display for roulette docs

These roulette docs weren't kept in step with the emoji. Attempts
to catch them up.

doc/development/code_review.md

@@ -74,19 +74,27 @@ It picks reviewers and maintainers from the list at the
 page, with these behaviors:
 
 1. It doesn't pick people whose Slack or [GitLab status](../user/profile/index.md#set-your-current-status):
-    - contains the string 'OOO', 'PTO', 'Parental Leave', or 'Friends and Family'
-    - emoji is `:palm_tree:`, `:beach:`, `:beach_umbrella:`, `:beach_with_umbrella:`, `:ferris_wheel:`, `:thermometer:`, `:face_with_thermometer:`, `:red_circle:`, `:bulb:`, `:sun_with_face:`.
-    - GitLab user busy indicator is set to true
+    - Contains the string 'OOO', 'PTO', 'Parental Leave', or 'Friends and Family'.
+    - GitLab user **Busy** indicator is set to `True`.
+    - Emoji is any of:
+      - 🌴 `:palm_tree:`
+      - 🏖️ `:beach:`, `:beach_umbrella:`, or `:beach_with_umbrella:`
+      - 🎡 `:ferris_wheel:`
+      - 🌡️ `:thermometer:`
+      - 🤒 `:face_with_thermometer:`
+      - 🔴 `:red_circle:`
+      - 💡 `:bulb:`
+      - 🌞 `:sun_with_face:`
 1. [Trainee maintainers](https://about.gitlab.com/handbook/engineering/workflow/code-review/#trainee-maintainer)
    are three times as likely to be picked as other reviewers.
 1. Team members whose Slack or [GitLab status](../user/profile/index.md#set-your-current-status) emoji
    is 🔵 `:large_blue_circle:` are more likely to be picked. This applies to both reviewers and trainee maintainers.
-   - Reviewers with `:large_blue_circle:` are two times as likely to be picked as other reviewers.
-   - Trainee maintainers with `:large_blue_circle:` are four times as likely to be picked as other reviewers.
+   - Reviewers with 🔵 `:large_blue_circle:` are two times as likely to be picked as other reviewers.
+   - Trainee maintainers with 🔵 `:large_blue_circle:` are four times as likely to be picked as other reviewers.
 1. People whose [GitLab status](../user/profile/index.md#set-your-current-status) emoji
-   is 🔶 `:large_orange_diamond:` are half as likely to be picked. This applies to both reviewers and trainee maintainers.
+   is 🔶 `:large_orange_diamond:` or 🔸 `:small_orange_diamond:` are half as likely to be picked. This applies to both reviewers and trainee maintainers.
 1. It always picks the same reviewers and maintainers for the same
-   branch name (unless their OOO status changes, as in point 1). It
+   branch name (unless their out-of-office (OOO) status changes, as in point 1). It
    removes leading `ce-` and `ee-`, and trailing `-ce` and `-ee`, so
    that it can be stable for backport branches.