Updates for restraints documentation (#156)

* Add note for confidence and min distance

* Update examples/restraints/README.md

Co-authored-by: Alex Rogozhnikov <arogozhnikov@users.noreply.github.com>

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Co-authored-by: Alex Rogozhnikov <arogozhnikov@users.noreply.github.com>

Author: wukevin

examples/restraints/README.md

@@ -21,6 +21,7 @@ A few other notes:
 - You may specify a mixture of `contact` and `pocket` restraints.
 - The `restraint_id` column must be unique.
 - The `comment` field is not read as an input and is included for user convenience.
+- The `confidence` and `min_distance_angstrom` fields are _currently_ not used by the model, and are included in this format for future-proofing.
 
 ## Example