Add doc-typehints to class properties found by the PropertyDocumentation
sniff to improve the documentation.
Once the sniff is enabled it avoids that new code is missing type
declarations. This is focused on documentation and does not change code.
Change-Id: I07ce1f37d1bfb18d6e73dd008a712b3ca60a80e9
Exceptions classes are nearly always value objects, and should in most
cases by newable.
Bug: T247862
Change-Id: I4faa8ec6ea8bc44086cfc8075b32d10eea61e9df