rust docs are unclear on safety

[andrewbanchich]

i noticed the root function says:

Note that verification is an experimental feature and may not be maximally performant or catch every error (though that is the goal).

the Access of untrusted buffers section here doesn't seem to clarify that this is experimental and may not catch all errors.

it's also unclear to me what kinds of errors the verifier will not catch and how they're handled. will flatbuffers ever panic if i use these safe functions? are uncaught errors just silent, incorrect data? memory safety issues?