add header for data dictionary

Author: aschey-forpeople

apps/bfd-model-idr/README.md

@@ -131,12 +131,13 @@ SYNTHETIC_CLM_ANSI_SGNTR.csv
 
 These files represent the schema of the tables the information is sourced from, although for tables other than CLM_DT_SGNTR, the CLM_UNIQ_ID is propagated instead of the 5 part unique key from the IDR.
 
-Data Dictionary Notes:
+### Data Dictionary
+
 Generally, the data dictionary will source definitions from the IDR's table definitions. There are instances where this may not be the definition we wish to publish. To overwrite the definition from the IDR, or populate a definition not available from the IDR, populate the "definition" key for the relevant concept in the relevant StructureDefinition. 
 
 Sometimes a field may be condensed at the IDR level, and fanned into multiple discrete components at the BFD / FHIR layer. An example is BENE_MDCR_STUS_CD. This code can indicate several interesting characteristics, such as ESRD status and disability status. A field, nameOverride, is available to directly populate names in the BFD DD for these fields that do not surface through a StructureDefinition. 
 To generate the data dictionary:
 
 ```sh
-python gen_dd.py
+uv run gen_dd.py
 ```