[GRASS-git] [OSGeo/grass] 6048ba: version: Update Sphinx config under man (#2967)

[Vaclav Petras]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 6048baccfd9942a5ae27f3075df699aba905d918
      https://github.com/OSGeo/grass/commit/6048baccfd9942a5ae27f3075df699aba905d918
  Author: Vaclav Petras <wenzeslaus at gmail.com>
  Date:   2023-05-22 (Mon, 22 May 2023)

  Changed paths:
    M man/sphinx/Makefile
    M man/sphinx/conf.py
    M man/sphinx/make.bat

  Log Message:
  -----------
  version: Update Sphinx config under man (#2967)

Version is updated to 8.4 and references to version are reduced. Word documentation is removed from names. Related duplicated values are reused using variables.