models: Fix typo in comments for get_users_by_delivery_email.
models: Fix typo in comments for get_users_by_delivery_email.

rht/zulip,showell/zulip,showell/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,punchagan/zulip,brainwane/zulip,kou/zulip,andersk/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,eeshangarg/zulip,brainwane/zulip,brainwane/zulip,rht/zulip,brainwane/zulip,zulip/zulip,eeshangarg/zulip,andersk/zulip,brainwane/zulip,showell/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,kou/zulip,punchagan/zulip,punchagan/zulip,eeshangarg/zulip,punchagan/zulip,brainwane/zulip,zulip/zulip,hackerkid/zulip,zulip/zulip,eeshangarg/zulip,showell/zulip,hackerkid/zulip,kou/zulip,hackerkid/zulip,rht/zulip,showell/zulip,andersk/zulip,showell/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,kou/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,punchagan/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,brainwane/zulip