linter: Document new special directory access errors

Author: bbhtt

docs/02-for-app-authors/12-linter.md

@@ -681,6 +681,42 @@ be used instead.
 Please consult the [Flatpak permission guide](https://docs.flatpak.org/en/latest/sandbox-permissions.html)
 and the [manual page](https://docs.flatpak.org/en/latest/flatpak-command-reference.html?highlight=filesystem#).
 
+### finish-args-flatpak-appdata-folder-access
+
+**Exceptions allowed**: Yes
+
+The [finish-args](https://docs.flatpak.org/en/latest/manifests.html#finishing)
+in the manifest has `filesystem` permission to `~/.var/app`.
+
+### finish-args-flatpak-system-folder-access
+
+**Exceptions allowed**: Yes
+
+The [finish-args](https://docs.flatpak.org/en/latest/manifests.html#finishing)
+in the manifest has `filesystem` permission to `/var/lib/flatpak`.
+
+### finish-args-flatpak-user-folder-access
+
+**Exceptions allowed**: Yes
+
+The [finish-args](https://docs.flatpak.org/en/latest/manifests.html#finishing)
+in the manifest has `filesystem` permission to `~/.local/share/flatpak`.
+
+### finish-args-host-tmp-access
+
+**Exceptions allowed**: Yes
+
+The [finish-args](https://docs.flatpak.org/en/latest/manifests.html#finishing)
+in the manifest has `filesystem` permission to `/tmp`.
+
+### finish-args-host-var-access
+
+**Exceptions allowed**: Yes
+
+The [finish-args](https://docs.flatpak.org/en/latest/manifests.html#finishing)
+in the manifest has `filesystem` permission to `/var` or a subdirectory
+of it.
+
 ### finish-args-absolute-run-media-path
 
 **Exceptions allowed**: No