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rgbasm supports "Q16.16" fixed-point literals

"Qm.n" signifies an m-bit two's complement integer
with n fractional bits.
<https://en.wikipedia.org/wiki/Q_(number_format)>

--- a/src/asm/rgbasm.5

+++ b/src/asm/rgbasm.5

@@ -91,13 +91,13 @@

 The instructions in the macro-language generally require constant expressions.

 .Ss Numeric Formats

 There are a number of numeric formats.

-.Bl -column -offset indent "Fixed point (16.16)" "Prefix"

+.Bl -column -offset indent "Fixed point (Q16.16)" "Prefix"

 .It Sy Format type Ta Sy Prefix Ta Sy Accepted characters

 .It Hexadecimal Ta $ Ta 0123456789ABCDEF

 .It Decimal Ta none Ta 0123456789

 .It Octal Ta & Ta 01234567

 .It Binary Ta % Ta 01

-.It Fixed point (16.16) Ta none Ta 01234.56789

+.It Fixed point (Q16.16) Ta none Ta 01234.56789

 .It Character constant Ta none Ta \(dqABYZ\(dq

 .It Gameboy graphics Ta \` Ta 0123

 .El