add markup for link in description

Co-authored-by: Rainer Leber <39616583+rainerleber@users.noreply.github.com>

Author: MatthiasWinzeler

plugins/modules/license_keys.py

@@ -12,7 +12,7 @@
 
 description:
  - This ansible module creates and updates systems and their license keys using the Launchpad API.
- - It is closely modeled after the interactions in the portal https://me.sap.com/licensekey:
+ - It is closely modeled after the interactions in the portal U(https://me.sap.com/licensekey):
  - First, a SAP system is defined by its SID, product, version and other data.
  - Then, for this system, license keys are defined by license type, HW key and potential other attributes.
  - The system and license data is then validated and submitted to the Launchpad API and the license key files returned to the caller.