added exception docs for recent throwif removal

This PR adds the documentation for exception calls that were introduced during the recent removal of the various throwif calls.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| Refs tickets  | 
| License       | MIT
| Doc PR        |