More documentation on caffe2_interface_library (#29903)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29903
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D18616888
Pulled By: ezyang
fbshipit-source-id: 360760a688dcc8ba117cd79d89db2afb2c35ab27
