docs(config): reword the user.home_base_dirs sample comment

The sentence wrapped so that a line began with "- the application's own
files.", which AsciiDoc renders as a list item once config-to-docs converts
config.sample.php into the admin manual's config parameters page.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Signed-off-by: Thomas Müller <1005065+DeepDiver1975@users.noreply.github.com>

Author: DeepDiver1975

config/config.sample.php

@@ -399,8 +399,8 @@
  * instance can be configured to read it from a user attribute. Such a value is
  * not necessarily controlled by the ownCloud administrator, so a home is only
  * accepted when it lies inside the configured `datadirectory`. A home pointing
- * at the ownCloud code directory would otherwise expose - and allow overwriting
- * - the application's own files.
+ * at the ownCloud code directory would otherwise expose the application's own
+ * files, and allow overwriting them.
  *
  * If user homes legitimately live outside of the data directory, for example on
  * a separate NFS mount, list the permitted base directories here. Any home