A few data types are missing and do not include ranges and size like most language docs do

Currently the main tutorial's data type section is missing the following data types:

- `size_t`
- `ssize_t`
- `unichar2`
- `string16`
- `string32`

Also, size and range information are not included, unlike most language tutorials which provide these ranges.

Proposal:

Add this information to the data types module in the main tutorial.