Link issues

[Resike]

The english basic.lua file gets generated with wrong links:

Invalid:
[tostring.](command:extension.lua.doc?["en-us/51/manual.html/pdf-tostring."])
[io.write.](command:extension.lua.doc?["en-us/51/manual.html/pdf-io.write."])
[string.format.](command:extension.lua.doc?["en-us/51/manual.html/pdf-string.format."])

They should be:
[tostring](command:extension.lua.doc?["en-us/51/manual.html/pdf-tostring"]).
[io.write](command:extension.lua.doc?["en-us/51/manual.html/pdf-io.write"]).
[string.format](command:extension.lua.doc?["en-us/51/manual.html/pdf-string.format"]).

I wasn't sure how these get generated, so that's why i didn't created a PR for this.