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Document underscores in numeric literals

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

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

@@ -105,6 +105,8 @@

 .It Gameboy graphics Ta \` Ta 0123

 .El

 .Pp

+Underscores are also accepted in numbers, except at the beginning of decimal ones.

+.Pp

 The "character constant" form yields the value the character maps to in the current charmap.

 For example, by default

 .Pq refer to Xr ascii 7