[Rpm-maint] [rpm-software-management/rpm] Some documentation improvements (#1599)

[Demi Marie Obenour]

> I'm curious where you encountered a compiler that doesn't do this, but looks fine to me.

At least GCC and Clang take advantage of signed integer overflow being undefined to perform optimizations, unless told not to.  And Clang *always* assumes that dereferencing NULL will never happen, and that the result of out-of-bounds pointer arithmetic will not be used.

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