message: Call out rule of relative path of `--config KEY=VALUE`
diff: @@ -245,6 +245,8 @@ Paths for non-executables will be relative to where the config value is defined.
  In particular, rules are:
  * For environment variables, paths are relative to the current working directory.
  +* For config values loaded directly from the [`--config KEY=VALUE`](#command-line-overrides) option,
  + paths are relative to the current working directory.
  * For config files, paths are relative to the parent directory of the directory where the config files were defined,
  no matter those files are from either the [hierarchical probing](#hierarchical-structure)
  or the [`--config <path>`](#command-line-overrides) option.
  