test_docs: Print better error messages for failed responses.
test_docs: Print better error messages for failed responses.

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