https://symfony.com/doc/current/contributing/documentation/standards.html
Documentation Standards (Symfony Docs)
Contributions must follow these standards to match the style and tone of the rest of the Symfony documentation: Use the following characters for each heading...
documentation standardssymfony docs
https://www.zimbra.com/product/documentation/
Documentation | Open Standards | Low-Risk Alternative | Data Sovereignty | Zimbra
open standardsalternative datadocumentationlowrisk
https://wiki.squid-cache.org/ProgrammingGuide/ManualDocumentation
man(8) documentation guidelines and standards | Squid Web Cache wiki
Squid Web Cache documentation
guidelines and standardsmandocumentationsquidweb