Update prefill widgets description for clarity

Author: prafull-opensignlabs

docs/docs/API-docs/v1.1/opensign.yaml

@@ -1807,7 +1807,7 @@ paths:
 
         **response:** Provide the value that should replace the existing response.
         
-        **Prefill Widgets:** Prefill widgets are elements that are inserted into a document before it is shared with a user. Only the document creator has permission to add them.
+        **Prefill Widgets:** Prefill widgets are elements that are inserted into a document **before** it is shared with a user. Only the document creator has permission to add them.
 
         **List of widgets supported in Prefill**
         1. **textbox**