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Update docs on char escapes in macro args
Fixes #415

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

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

@@ -583,8 +583,7 @@

 .Ic SHIFT .

 .Pp

 Line continuations work as usual inside macros or lists of arguments of macros.

-Strings, however, are a bit trickier.

-The following example shows how to use strings as arguments for a macro:

+However, some characters need to be escaped, as in the following example:

 .Pp

 .Bd -literal -offset indent

 PrintMacro : MACRO

@@ -591,8 +590,8 @@

     PRINTT \[rs]1

 ENDM

-    PrintMacro STRCAT(\[rs]"Hello\[rs]"\[rs],  \[rs]

-                      \[rs]" world\[rs]\[rs]n\[rs]")

+    PrintMacro STRCAT("Hello"\[rs],  \[rs]

+                      " world\[rs]\[rs]n")

 .Ed

 .Pp

 .Ic SHIFT