[TxMt] Tab trigger discoverability

[Nicolas Weber]

Hi,

>   At the moment there could be all sorts of triggers that I just  
> don't know I'm missing...

ctrl-opt-cmd-b opens the bundle editor. Select the html bundle, all  
html tab triggers are listed there.

Furthermore, when you hit ctrl-cmd-t while editing your document, you  
get a list of all commands you can use at the moment.

HTH,
Nico

ps: I like your suggestion