Add signature back to trilead ssh2 model

Author: egregius313

java/ql/lib/ext/com.trilead.ssh2.model.yml

@@ -9,7 +9,8 @@ extensions:
       - ["com.trilead.ssh2", "Connection", False, "authenticateWithNone", "(String)", "", "Argument[0]", "credentials-username", "manual"]
       - ["com.trilead.ssh2", "Connection", False, "authenticateWithPassword", "(String,String)", "", "Argument[0]", "credentials-username", "manual"]
       - ["com.trilead.ssh2", "Connection", False, "authenticateWithPassword", "(String,String)", "", "Argument[1]", "credentials-password", "manual"]
-      - ["com.trilead.ssh2", "Connection", False, "authenticateWithPublicKey", "", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.trilead.ssh2", "Connection", False, "authenticateWithPublicKey", "(String,char[],String)", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.trilead.ssh2", "Connection", False, "authenticateWithPublicKey", "(String,File,String)", "", "Argument[0]", "credentials-username", "manual"]
       - ["com.trilead.ssh2", "Connection", False, "authenticateWithPublicKey", "(String,char[],String)", "", "Argument[1]", "credentials-key", "manual"]
       - ["com.trilead.ssh2", "Connection", False, "authenticateWithPublicKey", "(String,char[],String)", "", "Argument[2]", "credentials-password", "manual"]
       - ["com.trilead.ssh2", "Connection", False, "authenticateWithPublicKey", "(String,File,String)", "", "Argument[2]", "credentials-password", "manual"]