cmake: spelling of messages for root7 compilation

cmake/modules/RootBuildOptions.cmake

@@ -308,9 +308,9 @@ ROOT_APPLY_OPTIONS()
 if(root7)
   if(NOT CMAKE_CXX_STANDARD)
       set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++14 standard used with root7")
-      message(STATUS "Enable C++14 for compilation of root7 components")
+      message(STATUS "Enabling C++14 for compilation of root7 components")
   elseif(NOT CMAKE_CXX_STANDARD GREATER 11)
-      message(FATAL_ERROR ">>> C++14 standard required with root7")
+      message(FATAL_ERROR ">>> At least C++14 standard required with root7")
    endif()
    if(NOT webui AND NOT webui_disabled)
       set(webui ON CACHE BOOL "(webui built automatically when root7 is enabled)" FORCE)