docs: Update realms documentation for REALMS_HAVE_SUBDOMAINS removal.
docs: Update realms documentation for REALMS_HAVE_SUBDOMAINS removal.

dhcrzf/zulip,zulip/zulip,punchagan/zulip,rht/zulip,brainwane/zulip,eeshangarg/zulip,jackrzhang/zulip,jackrzhang/zulip,brockwhittaker/zulip,shubhamdhama/zulip,tommyip/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,synicalsyntax/zulip,shubhamdhama/zulip,mahim97/zulip,hackerkid/zulip,showell/zulip,andersk/zulip,brainwane/zulip,showell/zulip,dhcrzf/zulip,zulip/zulip,zulip/zulip,synicalsyntax/zulip,showell/zulip,brainwane/zulip,timabbott/zulip,eeshangarg/zulip,shubhamdhama/zulip,synicalsyntax/zulip,dhcrzf/zulip,rishig/zulip,brockwhittaker/zulip,hackerkid/zulip,punchagan/zulip,shubhamdhama/zulip,timabbott/zulip,kou/zulip,timabbott/zulip,Galexrt/zulip,showell/zulip,eeshangarg/zulip,brockwhittaker/zulip,rht/zulip,kou/zulip,hackerkid/zulip,synicalsyntax/zulip,jackrzhang/zulip,eeshangarg/zulip,Galexrt/zulip,Galexrt/zulip,punchagan/zulip,rishig/zulip,mahim97/zulip,tommyip/zulip,tommyip/zulip,dhcrzf/zulip,kou/zulip,jackrzhang/zulip,shubhamdhama/zulip,rishig/zulip,rishig/zulip,andersk/zulip,brainwane/zulip,eeshangarg/zulip,rishig/zulip,andersk/zulip,brockwhittaker/zulip,eeshangarg/zulip,mahim97/zulip,dhcrzf/zulip,andersk/zulip,hackerkid/zulip,timabbott/zulip,dhcrzf/zulip,brainwane/zulip,synicalsyntax/zulip,timabbott/zulip,Galexrt/zulip,synicalsyntax/zulip,zulip/zulip,zulip/zulip,showell/zulip,eeshangarg/zulip,mahim97/zulip,jackrzhang/zulip,mahim97/zulip,rht/zulip,jackrzhang/zulip,rht/zulip,jackrzhang/zulip,punchagan/zulip,andersk/zulip,Galexrt/zulip,rht/zulip,zulip/zulip,punchagan/zulip,brockwhittaker/zulip,brainwane/zulip,brainwane/zulip,punchagan/zulip,kou/zulip,shubhamdhama/zulip,brockwhittaker/zulip,tommyip/zulip,Galexrt/zulip,rishig/zulip,timabbott/zulip,showell/zulip,punchagan/zulip,tommyip/zulip,dhcrzf/zulip,zulip/zulip,kou/zulip,showell/zulip,timabbott/zulip,shubhamdhama/zulip,kou/zulip,mahim97/zulip,rishig/zulip,kou/zulip,synicalsyntax/zulip,andersk/zulip,Galexrt/zulip,hackerkid/zulip,andersk/zulip,tommyip/zulip,tommyip/zulip,rht/zulip