Install client_lua_api.txt documentation too

fixes #9104

CMakeLists.txt

@@ -181,6 +181,7 @@ endif()
 
 install(FILES "README.md" DESTINATION "${DOCDIR}" COMPONENT "Docs")
 install(FILES "doc/lua_api.txt" DESTINATION "${DOCDIR}" COMPONENT "Docs")
+install(FILES "doc/client_lua_api.txt" DESTINATION "${DOCDIR}" COMPONENT "Docs")
 install(FILES "doc/menu_lua_api.txt" DESTINATION "${DOCDIR}" COMPONENT "Docs")
 install(FILES "doc/texture_packs.txt" DESTINATION "${DOCDIR}" COMPONENT "Docs")
 install(FILES "doc/world_format.txt" DESTINATION "${DOCDIR}" COMPONENT "Docs")