Update docs/workers.rst

E_TOO_MANY_NEGATIVES

Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

docs/workers.rst

@@ -242,7 +242,7 @@ be routed to the same instance::
 Pagination requests can also be handled, but all requests with the same path
 room must be routed to the same instance. Additionally, care must be taken to
 ensure that the purge history admin API is not used while pagination requests
-for the room are not in flight::
+for the room are in flight::
 
     ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/messages$