wgengine/magicsock: add more docs, checks to Test32bitAlignment

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Per recent chat with @raggi about all this, I went and looked at this
test again.

Updates #cleanup

Change-Id: Icb7d87b1ed2cebf481ee4e358a3aa603e63fb8a4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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