Update README.md

Author: smarina04

README.md

@@ -20,7 +20,7 @@ Agencies are encouraged to use the following HTML snippet to participate in the
 <script async type="text/javascript" src="https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=AGENCY" id="_fed_an_ua_tag"></script>
 ```
 
-Replace `AGENCY` with your agency's standard abbreviation or acronym (e.g. DHS, EPA, GSA, DOC etc.)
+### Agencies must replace `AGENCY` with their agency's standard acronym (e.g. DHS, EPA, GSA, DOC etc.)
 
 For more details about the DAP script capabilities, steps for adding DAP code to your website (including implementing with a tag manager), using custom parameters, DAP training etc., please refer to:
 * [DAP GA4 Release Notes](https://github.com/digital-analytics-program/gov-wide-code/wiki/DAP-Release-Notes)