No description for /W44640 compiler flag

[Ben1980]

The MSVC compiler flag /W44640 is not descripted in chapter MSVC

/W4 /W44640 - use these and consider the following

[Ben1980]

I think it might refer to /w14640 which is descripted

[jmarrec]

@lefticus wiki here needs a sweep too https://github.com/lefticus/cppbestpractices/wiki/Initial-Outline#msvc