see https://help.libreoffice.org/Calc/EOMONTH Dunno if this is also in localhelp, but at least the first line looks really strange.
It is in the local help. Submiting fix.
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=cc779bfd2a3c8f89e31ef7927fd0cd14f38f0461 tdf#97820 EOMONTH with strange boldface
This bug is not about a “gap” in the documentation, so I’ve no idea why it blocks bug 80430.