In source\text\scalc\01\01120000.xhp#par_id9838862.help.text is missing a <switchinline>-tag for MAC users. The entry: You can also press <switchinline select="sys"><caseinline select="MAC">Command</caseinline><defaultinline>Ctrl</defaultinline></switchinline>+Page Up and Ctrl+Page Down keys to scroll through the pages. should mean: You can also press <switchinline select="sys"><caseinline select="MAC">Command</caseinline><defaultinline>Ctrl</defaultinline></switchinline>+Page Up and <switchinline select="sys"><caseinline select="MAC">Command</caseinline><defaultinline>Ctrl</defaultinline></switchinline>+Page Down keys to scroll through the pages.
Andras Timar committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=580a405c08ef8f07a38b26127afe5856d3faf45e fdo#54734 Missing <switchinline>-tag for MAC in Help par_id9838862 The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.