search help: Fix buggy rendering of stream search example.
search help: Fix buggy rendering of stream search example.

Due to a typo, we've had the example email address as the search
operator for some time :(.

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