Tupple index vs integer literal

[martin-t]

The section about integer literals got expanded in 8e79044 to include tupple inxex but the surrounding text did not.

• It still says an integer literal has 4 forms instead of 5.

• It talks about suffixes but a tupple index can't have a suffix. It also discussed types but a tupple index probably doesn't really have a type since it only exists at compile time.