[tipc] Expose Handle::from_raw in TIPC rust

Background:
We sometimes, in user code, need to create a handle from a raw file
dezcriptor that is passed to us from C. Therfore, we need to expose the
`from_raw` function as public.

New Stuff:
* `from_raw` is now fully public, added docs

Bug: 314013565

Change-Id: I33fffe3cd6153bba1ad646f8e56fc93177b2e4b2
Signed-off-by: Ross Kettleson <kettro@google.com>
1 file changed