man: document the -u defaulting
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@ -94,7 +94,8 @@ decrypt it.
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.TP
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\fB\-u\fR, \fB\-\-user\fR <\fIkeyspec\fR>
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Specify a private key to use for signing the message.
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Specify a private key to use for signing the message. If this option is empty,
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it is defaulted from CCR_USER environment variable.
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.TP
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\fB\-C\fR, \fB\-\-cleartext\fR
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