Fix documentation URL in YAML (#902).

borgmatic/config/schema.yaml

@@ -233,9 +233,9 @@ properties:
             passcommand/repokey/keyfile encryption. Note that if both
             encryption_passcommand and encryption_passphrase are set, then
             encryption_passphrase takes precedence. This can also be used to
-            access encrypted systemd service credentials (see "https://torsion\
-            .org/borgmatic/docs/how-to/provide-your-passwords/#using-systemd-\
-            service-credentials"). Defaults to not set.
+            access encrypted systemd service credentials. Defaults to not set.
+            For more details, see:
+            https://torsion.org/borgmatic/docs/how-to/provide-your-passwords/
         example: "secret-tool lookup borg-repository repo-name"
     encryption_passphrase:
         type: string