doc: Example configuration file for vpnd

diff --git a/vpn/connman-vpn.conf b/vpn/connman-vpn.conf
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+[General]
+
+# Set input request timeout. Default is 300 seconds
+# The request for inputs like passphrase will timeout
+# after certain amount of time. Use this setting to
+# increase the value in case of different user
+# interface designs.
+# InputRequestTimeout = 300