Update hdinsight-administer-use-portal-linux.md

Author: mimig1

articles/hdinsight/hdinsight-administer-use-portal-linux.md

@@ -217,7 +217,7 @@ The password is changed on all nodes in the cluster.
 > [!NOTE]
 > SSH passwords cannot contain the following characters:
 > ```
-> " ' ` / \ < % ~ | $ &  
+> " ' ` / \ < % ~ | $ & ! 
 > ```
 
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