doc update (#1750)

Author: SFJohnson24

docs/PYPI.md

@@ -69,10 +69,12 @@ from cdisc_rules_engine.utilities.utils import get_rules_cache_key
 
 cache = load_rules_cache("path/to/rules/cache")
 # Note: version uses dashes, not dots
-rules = cache.get_all_by_prefix(get_rules_cache_key("sdtmig", "3-4"))
+rule_keys = cache.get_all_by_prefix(get_rules_cache_key("sdtmig", "3-4"))
+rules = [cache.get(key) for key in rule_keys[0]]
 ```
 
-Each rule is a dict with keys: `core_id`, `domains`, `author`, `reference`, `sensitivity`, `executability`, `description`, `authorities`, `standards`, `classes`, `rule_type`, `conditions`, `actions`, `datasets`, `output_variables`.
+`get_all_by_prefix` returns a nested list of cache keys, not rule objects directly. Fetch the actual rule dicts by calling cache.get() on each key.
+Each rule is a dict with keys: `core_id`, `domains`, `author`, `reference`, `sensitivity`, `executability`, `description`, `authorities`, `standards`, `classes`, `rule_type`, `conditions`, `actions`, `output_variables`.
 
 If you have rules in raw CDISC metadata format, convert them first: