There is this page: https://help.libreoffice.org/Calc/OpenCL_Options It seems to be the help page for the dialog accessible this way: Menu Tools - Options - LibreOffice Calc - Formula, and in section Detailed Calculation Settings press Details... button. However, if I press F1 or Help in the dialog, this useless page comes up instead: https://help.libreoffice.org/scalc/modules/scalc/ui/formulacalculationoptions/comboConversion?Language=en-US&System=WIN&Version=5.1 (this is for the first combo box, but none of the other UI elements produce useful help)
Note that Tor's commit to bug 101063 removed all OpenCL Options from Calc (the ones in LibreOffice remain), which means the help will have to change in 5.3.
Confirmed the behavior, when offline help is not present. Otherwise the OpenCL options page is displayed. Arch Linux 64-bit, KDE Plasma 5 Version: 5.2.0.4 Build ID: 5.2.0-1 CPU Threads: 8; OS Version: Linux 4.6; UI Render: default; Locale: fi-FI (fi_FI.UTF-8) Arch Linux 64-bit, KDE Plasma 5 Version: 5.3.0.0.alpha0+ Build ID: f3d26af51588af441f62fb69bb7a5432845226ac CPU Threads: 8; OS Version: Linux 4.6; UI Render: default; Locale: fi-FI (fi_FI.UTF-8); Calc: group Built on August 5th 2016
Same problem with new online help. Gives https://help.libreoffice.org/6.1/en-US/text/scalc/main0000.html?System=WIN&DbPAR=CALC
Open Detailed Calculations dialog in Options (Alt-F12) Press "Help" button Relevant help page is shown. Tested successfully with 6.3.6.2 and 7.2.0.0.alpha0+ -- closing as WFM