nasmdoc.src: document %exitmacro
\b A number of enhancements/fixes in macros area.
+\b Support for arbitrarily terminating macro expansions \c{%exitmacro}.
+ See \k{exitmacro}.
+
+\b Support for recursive macro expansion \c{%rmacro/irmacro}.
+ See \k{mlrmacro}.
+
+\b Support for converting strings to tokens. See \k{deftok}.
+
\b Fuzzy operand size logic introduced.
+\b Fix Macho-O alignment bug.
+
\b Fix crashes with -fwin32 on file with many exports.
\b Fix stack overrun for too long [DEBUG id].
\b Warn a user if a constant too long (and as a result will be stripped).
+
\S{cl-2.07} Version 2.07
\b NASM is now under the 2-clause BSD license. See \k{legal}.
does \e{not} remove the macro \c{bar}, since the argument
specification does not match exactly.
+
+\S{exitmacro} Exiting Multi-Line Macros: \i\c{%exitmacro}
+
+Multi-line macro expansions can be arbitrarily terminated with
+the \c{%exitmacro} directive.
+
+For example:
+
+\c %macro foo 1-3
+\c ; Do something
+\c %if<condition>
+\c %exitmacro
+\c %endif
+\c ; Do something
+\c %endmacro
+
\H{condasm} \i{Conditional Assembly}\I\c{%if}
Similarly to the C preprocessor, NASM allows sections of a source