Fixing whitespaces

Currently, the code snippet is not copy-paste friendly. It contains the whitespaces that causes editor issue when saving the policy:

The ' ' character, hexadecimal value 0xA0, cannot be included in a name.

Author: maciejtreder

articles/api-management/validate-client-certificate-policy.md

@@ -35,15 +35,15 @@ For more information about custom CA certificates and certificate authorities, s
     validate-not-after="true | false" 
     ignore-error="true | false">
     <identities>
-        <identity 
+        <identity
             thumbprint="certificate thumbprint"
             serial-number="certificate serial number"
             common-name="certificate common name"
             subject="certificate subject string"
             dns-name="certificate DNS name"
             issuer-subject="certificate issuer"
             issuer-thumbprint="certificate issuer thumbprint"
-            issuer-certificate-id="certificate identifier" />
+            issuer-certificate-id="certificate identifier"/>
     </identities>
 </validate-client-certificate> 
 ```
@@ -106,4 +106,4 @@ The following example validates a client certificate to match the policy's defau
 
 * [API Management access restriction policies](api-management-access-restriction-policies.md)
 
-[!INCLUDE [api-management-policy-ref-next-steps](../../includes/api-management-policy-ref-next-steps.md)]
+[!INCLUDE [api-management-policy-ref-next-steps](../../includes/api-management-policy-ref-next-steps.md)]