Documentation for `check_output_custom`
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Description
**Is your feature request related to a problem? Please describe.**
Custom output-checking is something people want, but we don't make it easy. Closes is unit tests: https://github.com/DAGWorks-Inc/hamilton/blob/e55cb4daed0aa3fc38fe338d606470ebe1371127/tests/function_modifiers/test_validation.py#L132. Otherwise it says "ask in slack"
**Describe the solution you'd like**
Documentation in `readthedocs`
**Additional context**
https://hamilton-opensource.slack.com/archives/C03M33QB4M8/p1688457568511989
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