Tweaks to gapmacro.tex and etc/convert.pl #6886

Job	Run time
Cross compiler for s390x	51m 37s
teststandard - - ubuntu-latest	21m 18s
testinstall - - ubuntu-latest	7m 2s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	8m 5s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	9m 13s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	30m 33s
testmanuals - - ubuntu-latest	6m 55s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-22.04	4m 49s
testpackages testinstall-loadall - - ubuntu-latest	33m 9s
testmockpkg testinstall testworkspace - BOOTSTRAP_MINIMAL=yes - macos-latest	8m 34s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	10m 31s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-22.04	7m 13s
testmockpkg testinstall - - windows-2022	19m 21s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	6m 14s
Test in OpenBSD	10m 34s
Send Slack notification on status change	-1s
	3h 55m 7s

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