https://www.gnu.org/software/automake/manual/html_node/Yacc-and-Lex.html includes the section heading "8.8.1 Linking Multiple Yacc Parsers," but the section itself appears to be empty. Its (apparent) intended contents can be reached from https://www.gnu.org/software/automake/manual/html_node/Linking-Multiple-Yacc-Parsers.html,
Thanks for the report. Unfortunately I transposed the @node and @subsubsection commands (putting the @node second) when I split that material off into its own node earlier this year. I am somewhat surprised makeinfo did not warn about it, but anyway, I just corrected the ordering, and updated Yacc-and-Lex.html in the CVS webpages repository. Not sure how long it will take to show up on the live server. --thanks, karl.