Fix HostnameMismatch troubleshooting formatting
Fix HostnameMismatch troubleshooting formatting

<x> and <y> are not rendered as html code element, 
therefore this commit introduces spaces.
Fixes formatting error introduced with 5dc50dd0521cdca91d287a44c59f691011165c93

Furthermore, adds a missing comma.

Signed-off-by: Jürgen Walter <2953511aa3aba111732d3f11e995f4daa23215ea@sap.com>
cloudfoundry/docs-cf-admin