* ini_file: Don't creates new file instead of following symlink
This is a bug fix that address a situation where `community.general.ini_file`
was destroying symlinks instead of updating of updating their targets.
Closes: #6470
* ini_file: add the follow parameter
If `poth` points on a symlink and `follow` is true, the `ini_file` plugin
will preserve the symlink and modify the target file.
* adjust the documentation of the new key
- yes/no -> true/false.
- new key will be introduced in 7.1.0.
- clean up the `state=link` part.
