[bug #63028] document nroff \o limitations in modern terminal emulators

[Dave]

Follow-up Comment #2, bug #63028 (project groff):

True and then some: unlike grotty, which outputs overstruck characters that
terminals probably won't render, grohtml appears to output only the final
character of an \o sequence.

$ printf '\o"x+o"\n' | groff -Thtml | grep -o '<p>.*</p>' | od -c
                                                1.   <   p   >   o   <   /   p  
 >  \n
0000011



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