docs: Fix typo in production/email.md.
docs: Fix typo in production/email.md.

kou/zulip,zulip/zulip,eeshangarg/zulip,brainwane/zulip,brainwane/zulip,hackerkid/zulip,hackerkid/zulip,shubhamdhama/zulip,kou/zulip,synicalsyntax/zulip,synicalsyntax/zulip,rht/zulip,showell/zulip,rht/zulip,zulip/zulip,brainwane/zulip,eeshangarg/zulip,punchagan/zulip,timabbott/zulip,punchagan/zulip,rht/zulip,andersk/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,zulip/zulip,rht/zulip,kou/zulip,shubhamdhama/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,brainwane/zulip,shubhamdhama/zulip,andersk/zulip,showell/zulip,brainwane/zulip,punchagan/zulip,timabbott/zulip,showell/zulip,showell/zulip,andersk/zulip,showell/zulip,synicalsyntax/zulip,brainwane/zulip,synicalsyntax/zulip,kou/zulip,brainwane/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,rht/zulip,showell/zulip,synicalsyntax/zulip,timabbott/zulip,synicalsyntax/zulip,timabbott/zulip,shubhamdhama/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,timabbott/zulip,showell/zulip,shubhamdhama/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,shubhamdhama/zulip,kou/zulip,eeshangarg/zulip,timabbott/zulip,synicalsyntax/zulip,punchagan/zulip,zulip/zulip,shubhamdhama/zulip,zulip/zulip,timabbott/zulip,eeshangarg/zulip