[Atlas] Broken link for "connection pooling"

Description

The second paragraph of https://docs.atlas.mongodb.com/reference/alert-resolutions/connection-alerts/ references "connection pooling", which links to https://docs.mongodb.com/manual/reference/connection-string/index.html/#connection-pool-options and 404s

Seems to have still been valid as of 4.2 - https://docs.mongodb.com/v4.2/reference/connection-string/#connection-pool-options

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)