doc: Update doc cache delimiter to work with Texinfo 5.0 (bug #39778) * doc/interpreter/mk_doc_cache.m: Change doc delimiter to ASCII 30 (record separator) because Texinfo 5.0 uses ASCII 31 (unit separator). Use hexadecimal representation for consistency with other scripts. * libinterp/corefcn/help.cc (install_built_in_docstrings): Change doc delimiter to ASCII 30 (record separator). * doc/interpreter/munge-texi.pl, libinterp/gendoc.pl, scripts/mkdoc.pl: Change doc delimiter to ASCII 30 (record separator). Use hexadecimal escape sequence for consistency and to avoid using literal control characters.

gnulib-hg = gnulib-hg