I'm not sure where the "Documentation" section of ApiSandbox comes from, but it currently has inconsistent (and, in some cases, wrong) grammar.
list=exturlusage --> euquery --> "Protocol of the url. If empty and euquery set, the protocol is http.
Leave both this and euquery empty to list all external links"
"URL" should be capitalized.
Ends in a period?
action=coderevisionupdate --> "Submit comments, new status and tags to a revision"
No final period?
action=wikiloveimagelog --> "This API is for logging each time a user attempts to use a custom image via WikiLove."
"This API"? This isn't consistent language with the documentation for the rest of the parameters. And it ends in a period.
These are just a few examples. Consistent style should be applied throughout. If the text is going to end in periods, it should end in periods every time. If "URL" is going to be capitalized (when used in documentation text), it should be consistently capitalized. Etc.