Update the Sidekiq/Sidekiq retries page
Update the Sidekiq/Sidekiq retries page

Remove the Graphite details, these are wrong, and it's probably more
useful to just link to the monitoring page, which contains details
about Grafana and Sidekiq web, which are the useful ways of viewing
this information. Also bump the review date.

alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs