[Rpm-maint] [rpm-software-management/rpm] Document trailer invariants (#1481)

[Demi Marie Obenour]

When working on #1471 I found that the invariants of the trailer are not documented anywhere I could find.  I expected them to be as follows:

- The trailer must come after the last index entry in the contiguous region.
- The trailer must not overlap with any other header entry, whether in the region or otherwise.
- The trailer must come before any data not in the region.

These should be documented so that code in librpm knows what it can rely on.

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