Update omop-ohdsi-resources.md

Author: BoyceLab

docs/omop-ohdsi-resources.md

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 [Open, rigorous and reproducible research: A practitioner’s handbook](https://datascience.stanford.edu/programs/stanford-data-science-scholars-program/data-science-handbook) — Stanford Data Science
 
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 ## 🧰 Data Management Tools & Resources
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 - [OHDSI software](https://ohdsi.org/software-tools/)  
 - [NIH All of Us — OMOP documentation](https://support.researchallofus.org/hc/en-us/articles/360039585391-How-the-Observational-Medical-Outcomes-Partnership-OMOP-vocabulary-are-structured)
 
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 ## ⭐ Special Topic: Clinical Registries Using OHDSI