Consistency between local.d config files and docs

[TonyGravagno]

In local.d, config files have help comments at the top that refer to specific documentation pages. I propose standardization and correction for the worker configs.

Currently:

• worker-controller.inc > no link in file
• worker-fuzzy.inc > doc/fuzzy_storage.html
• worker-normal.inc > doc/workers/rspamd_proxy.html (yes, copy/paste error)
• worker-proxy.inc > doc/workers/rspamd_proxy.html

Suggested:

• worker-controller.inc > doc/workers/controller.html (page exists, this is a core correction)
• worker-fuzzy.inc > doc/workers/fuzzy_storage.html (page exists, this is a core correction)
• worker-normal.inc > doc/workers/normal.html (page exists, this is a core correction)
• worker-proxy.inc > doc/workers/proxy.html (we know it's rspamd, copy page and link/forward from current page)