bot docs: Clean up "Testing a bot's output".
bot docs: Clean up "Testing a bot's output".

The main cleanup here is to move the examples out of the bulleted
list, which was getting rendered in an ugly/confusing way.

I also removed some redundant text, fixed some typos, and changed
the wording a bit.

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