Update Todos documentation and screenshots to include new functionality.
Updates documentation for todos, includes updated and new screenshots.
See also !4502 and #18906Closes#18923
[ci skip]
See merge request !4840
Expand on Award Emoji documentation, update/add screenshots.
Adds documentation for award emoji now that comments can be awarded with emojis.
See also !4291 and #18906Closes#9091
cc: @virtuacreative @axil
See merge request !4839
Signed-off-by: Rémy Coutable <remy@rymai.me>