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Mention that SHIFT updates _NARG

Fixes #598

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

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

@@ -978,7 +978,7 @@

 .It Ic EQU Ta Dv @ Ta PC value (essentially, the current memory address)

 .It Ic EQU Ta Dv _PI Ta Fixed point \[*p]

 .It Ic SET Ta Dv _RS Ta _RS Counter

-.It Ic EQU Ta Dv _NARG Ta Number of arguments passed to macro

+.It Ic EQU Ta Dv _NARG Ta Number of arguments passed to macro, updated by Ic SHIFT

 .It Ic EQU Ta Dv __LINE__ Ta The current line number

 .It Ic EQUS Ta Dv __FILE__ Ta The current filename

 .It Ic EQUS Ta Dv __DATE__ Ta Today's date

@@ -1282,7 +1282,9 @@

 Very useful in

 .Ic REPT

 blocks.

-It will shift the arguments by one to the left.

+It will shift the arguments by one to the left, and decrease

+.Dv _NARG

+by 1.

 .Ic \[rs]1

 will get the value of

 .Ic \[rs]2 , \[rs]2