doc/dlb.6: Use correct scaling unit for ems
In *roff numeric expressions, ems are spelled "m", not "em". https://www.gnu.org/software/groff/manual/groff.html.node/Measurements.html
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In *roff numeric expressions, ems are spelled "m", not "em". https://www.gnu.org/software/groff/manual/groff.html.node/Measurements.html