Hexadecimal-Encoded String and Int Literals

[jseldess]

See cockroachdb/cockroach#7138

Add Hexadecimal-Encoded Strings to strings.md and Hexadecimal-Encoded Ints to int.md.

From chat with @jordanlewis:

It seems like the best place for it would be a new stanza below String Literal and Escape String called Hexadecimal-Encoded String Literal or something of that sort

[10:02]  
mysql calls them “hex literals” but for us they’re always strings

[10:02]  
https://dev.mysql.com/doc/refman/5.7/en/hexadecimal-literals.html

[10:02]  
well, the x’blah’ style is a string, and the 0xblah thing we already support are always numbers

Jesse Seldess [10:03 PM]  
I see. so 0xblah is already a valid format for integers?

Jordan Lewis [10:03 PM]  
yes

Jesse Seldess [10:03 PM]  
ok, so that's a doc to update then.

Jordan Lewis [10:03 PM]  
maybe not documented yet? i haven’t taken a good look at the docs yet

[10:03]  
yeah

Jesse Seldess [10:04 PM]  
Yeah, docs say `INT` format is just a literal number: https://www.cockroachlabs.com/docs/int.html#format

[10:04]  
So we can add an alternative.

Jordan Lewis [10:06 PM]  
sounds good