Vault Documentation: Modified What is Vault description (#12783)

* modified vault description

* modified paragraph based on feedback

* Update what-is-vault.mdx

Removed characters that were arbitrarily added.

* Update what-is-vault.mdx

changed markdown syntax for 'secret's

website/content/docs/what-is-vault.mdx

@@ -20,10 +20,7 @@ available features as well as internals.
 
 ## What is Vault?
 
-Vault is a tool for securely accessing _secrets_. A secret is anything that you
-want to tightly control access to, such as API keys, passwords, or certificates.
-Vault provides a unified interface to any secret, while providing tight access
-control and recording a detailed audit log.
+Vault is an identity-based **secrets** and encryption management system. A secret is anything that you want to tightly control access to, such as API encryption keys, passwords, or certificates. Vault provides encryption services that are gated by authentication and authorization methods. Using Vault’s UI, CLI, or HTTP API, access to secrets and other sensitive data can be securely stored and managed, tightly controlled (restricted), and auditable.
 
 A modern system requires access to a multitude of secrets: database credentials,
 API keys for external services, credentials for service-oriented architecture