Update ms-exchange-server.yaml description

While the NSE script this template is sourced from does check for CVES, this template does not.

http/technologies/microsoft/ms-exchange-server.yaml

@@ -4,7 +4,7 @@ info:
   name: Microsoft Exchange Server Detect
   author: pikpikcu,dhiyaneshDK
   severity: info
-  description: Check for Exchange Server CVEs CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065, using Outlook Web App path data.
+  description: Check for presence of Exchange Server using Outlook Web App path data.
   reference:
     - https://github.com/GossiTheDog/scanning/blob/main/http-vuln-exchange.nse
   metadata: