Move the whole contents of the overview doc comment from object.h
to qom.rst.
This makes the documentation source easier to read and edit, and
also solves the backslash escaping issue at the typecasting macro
examples.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20200910221526.10041-10-ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>