devtools: Improve labels and headings for some tools.
devtools: Improve labels and headings for some tools.

It's useful to be a bit more clear about what precisely these tools
are for.

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