Provide documentation/syntax for messages

Hi, it would be great if there could be some in-product help about the available syntax that can be used for messages. We've gathered the following so far (kudos to Caleb James DeLisle for creating it):

* To type a message with multiple lines, use shift+enter to create a new line inside of your message, use regular enter key in order to send your message
* To send a message with some code on one line, use \```triple-backtick``` around your code (like in markdown)
* To paste a whole bunch of code in a message: triple-backtick, shift+enter, paste, shift+enter, triple-backtick and finally enter to send the message
* To make some __italic__ content in a message, put that content inside of \*stars*
* To make some **bold** content in a message, put that content inside of \*\*double-stars**
* Emoticons are not included in matrix by default, but emoji work. Mac users can make emoji by typing alt+command+space and then selecting from an emoji pallette. Everyone can copy/paste it if necessary. You can also use colon and parenthecy :)
* If you want to make emoji, you need to go to http://unicode.org/emoji/charts/full-emoji-list.html and copy the emoji you want from the *first* column but remember that in matrix it will appear the way it shows in the *fifth* column (because riot.im app uses the *One* emoji rendering library).
* To personalize your nickname, use /nick yourname and paste the emoji characters in your name. Note that putting emoji at the *beginning* of your name will make it difficult for people to use tab-complete to message you.

Are there any more? :)

I couldn't find any documentation page on the web with this information either. But IMO it would be the nicest if it could be included in the product.

WDYT?