Merge pull request #2855 from koelle25/fix-ldap-background-sync-documentation

Fix ldap background sync documentation

docker-compose.yml

@@ -441,9 +441,9 @@ services:
       #- LDAP_BACKGROUND_SYNC=false
       #
       # At which interval does the background task sync in milliseconds.
-      # Leave this unset, so it uses default, and does not crash.
-      # https://github.com/wekan/wekan/issues/2354#issuecomment-515305722
-      - LDAP_BACKGROUND_SYNC_INTERVAL=''
+      # The format must be as specified in:
+      # https://bunkat.github.io/later/parsers.html#text
+      - LDAP_BACKGROUND_SYNC_INTERVAL='every 1 hour'
       #
       #- LDAP_BACKGROUND_SYNC_KEEP_EXISTANT_USERS_UPDATED=false
       #