Update documentation for NetworkSecurityPolicy

(cherry picked from commit d4e9f2472ad1995f0a27769b8310a29492c519c4)

Bug: 185153775
Test: m
Merged-In: I5507678bd18902d1d23b39cfb288c71bb8ce2f20
Change-Id: Iaf9ff498c0418365f0761524c8f5727aa582e128
1 file changed