Man pages matching name xkbkeytypesforcoresymbols in section 3:

XkbKeyTypesForCoreSymbols.3.en	debian 10 / libx11-doc
XkbKeyTypesForCoreSymbols.3.en	debian 11 / libx11-doc
XkbKeyTypesForCoreSymbols.3.en	debian 12 / libx11-doc