Add anchor links on each individual cluster setting and session variable

John Sheaffer (sheaffej) commented:

Please consider adding an anchor link to each individual cluster setting and session variable on the following pages:
https://www.cockroachlabs.com/docs/v20.2/cluster-settings.html
https://www.cockroachlabs.com/docs/v20.2/set-vars.html

When referring customers or co-workers to specific cluster settings or session variables, it would be very helpful to send a link to a specific setting or variable, vs a link to the page listed above and having the recipient search the page to find the setting or variable.

For example in the current docs with no anchor links:

Compare to the Prometheus docs that have anchor links for each setting:

Jira Issue: DOC-962