docs: Update screenshot-and-gif-software.
docs: Update screenshot-and-gif-software.

This adds a few more standard screenshot capture tools.

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