Wei Zhou

Update https://cloudstack-documentation--392.org.readthedocs.build/en/392/adminguide/host_and_storage_tags.html#host-tags

@shwstppr I added some lines in this PR. you can find the `flexible tags` section on same page we could add more info , do you have advice ?

> @weizhouapache It would be good to have a note explaining that flexible tags must always be explicit added @JoaoJandre

@btzq @CodeBleu I just want to point out that the UI and api are inconsistent. 'Rule #' on UI = 'number' in Api 'Description' on UI = 'reason' in Api...

/run-e2e -c 4.18

/reopen

/hold

/run-e2e help

/run-e2e -c 4.18 -h kvm

/run-e2e -c 4.18 -h vmware