Update key-vault-whatis.md

Author: prashanthyv

articles/key-vault/key-vault-whatis.md

@@ -23,7 +23,7 @@ Azure Key Vault helps solve the following problems
 - Azure Key Vault can be used to Securely store and tightly control access to tokens, passwords, certificates, API keys, and other secrets
 - Azure Key Vault can also be used as a Key Management solution. Azure Key Vault makes it easy to create and control the encryption keys used to encrypt your data. 
 - Azure Key Vault is also a service that lets you easily provision, manage, and deploy public and private Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificates for use with Azure and your internal connected resources. 
-- The secrets / keys can be backed either by software or hardware such as HSMs
+- The secrets and keys can be protected either by software or FIPS 140-2 Level 2 validates HSMs
 
 ## Basic concepts