Update left nav for Admin Area

Small change to navigation instructions.

Author: amyq

doc/settings/memory_constrained_envs.md

@@ -227,7 +227,7 @@ These features are no longer needed if monitoring is disabled.
 To disable these features you need to go to Admin Area of GitLab
 and disable the Prometheus Metrics feature:
 
-1. On the left sidebar, expand the top-most chevron (**{chevron-down}**).
+1. On the left sidebar, select **Search or go to**.
 1. Select **Admin Area**.
 1. Select **Settings > Metrics and profiling**.
 1. Expand **Metrics - Prometheus**.