Update README.md

NVD OS vs Application Vulnerabilities/README.md

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 ## Introduction
 Our customers wanted the ability to identify & filter vulnerabilities by their classification like OS & Application. 
-Full working process on how this can be done using the custom field option can be found documented in the attached Vulnerability Type Use case Document.
+Full working process on how this can be done using the custom field option can be found documented in the attached Vulnerability Type Custom Field.
 
 This script handles the step#2 listed on the document, where a CSV is required as an input with the CVEs and their classification. 
 NVD database was referenced to get this information by following the steps below: