Update docs/webadministration.rst
Update docs/webadministration.rst

typo

Co-authored-by: Dario Ernst <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@kanojo.de>
kaiyou/freeposte.io,kaiyou/freeposte.io,kaiyou/freeposte.io,kaiyou/freeposte.io