documentation

Pull request #4315: feature/DEV-4880-7.5-D-v2

Merge in WEB/documentation from feature/DEV-4880-7.5-D-v2 to release/8.0

* commit '2671ba9440fcd14b33c0a776b02a1fb1fba1b0d6':
  [DEV-4880] changed "frontend" to "web interface"
  [DEV-4880] removed line break
  [DEV-4880] reworked the log_bin_trust_function_creators note into instructions (updated missed sentence)
  [DEV-4880] fixed typos
  [DEV-4880] log_bin_trust_function_creators: added missing step, reworded steps, and replaced the link to MySQL
  [DEV-4880] reworked the log_bin_trust_function_creators note into instructions
  [DEV-4880] unified step description for Zabbix server and web interface containers
  [DEV-4880] added "--init" to commands for deploying the Zabbix server container
  [DEV-4880] reordered PostgreSQL-related environment variables to match other sections
  [DEV-4880] fixed the description for deploying the Zabbix server container
  [DEV-4880] shortened the Ctrl+C tip
  [DEV-4880] reworked "docker logs" notes into separate steps
  [DEV-4880] added "PHP_TZ" variable to the Zabbix web interface deployment step
  [DEV-4880] moved the reminder about passwords from each step to the first step
  [DEV-4880] removed the "--authentication-policy" variable, as "caching_sha2_password" is already the default
  [DEV-4880] improved note on checking container status; added such note to each section
  [DEV-4880] added missing RHEL version