[analyzer] Website: update lists of potential and actual checkers.
- memory.MismatchedDelete, memory.MultipleDelete, and memory.DeallocateNonPtr
are complete (unix.MismatchedDeallocator and cplusplus.NewDelete)
- Per discussion on the mailing list, different.UnaryPlusWithUnsigned has
dubious value; remove it.
- Add potential checker ctordtor.PlacementSelfCopy per an internal bug report.
- core.AttributeNonNull is now core.NonNullParamChecker, though no one should
be depending on this name anyway.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179900
91177308-0d34-0410-b5e6-
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