Fix archive checks being skipped even when particular archives haven't been checked recently (#688).

docs/how-to/deal-with-very-large-backups.md

@@ -95,6 +95,7 @@ See [Borg's check
 documentation](https://borgbackup.readthedocs.io/en/stable/usage/check.html)
 for more information.
 
+
 ### Check frequency
 
 <span class="minilink minilink-addedin">New in version 1.6.2</span> You can

docs/how-to/make-per-application-backups.md

@@ -81,6 +81,9 @@ If `archive_name_format` is unspecified, the default is
 `{hostname}-{now:%Y-%m-%dT%H:%M:%S.%f}`, meaning your system hostname plus a
 timestamp in a particular format.
 
+
+### Achive filtering
+
 <span class="minilink minilink-addedin">New in version 1.7.11</span> borgmatic
 uses the `archive_name_format` option to automatically limit which archives
 get used for actions operating on multiple archives. This prevents, for