Update Set-Label.md

Author: heikobischoff

exchange/exchange-ps/exchange/Set-Label.md

@@ -581,7 +581,11 @@ Accept wildcard characters: False
 ```
 
 ### -ContentType
-{{ Fill ContentType Description }}
+The ContentType parameter specifies where the sensivity label can be applied to. Possible values are:
+- File, Email
+- Site, UnifiedGroup
+- PurviewAssets
+Values can be combined, for example "File, Email, PurviewAssets". Splitting related content types like "File, Email" is not supported.
 
 ```yaml
 Type: MipLabelContentType