update man pages to forbid running on live metadata
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		| @@ -15,6 +15,8 @@ the device-mapper era target on a | ||||
| or | ||||
| .I file. | ||||
|  | ||||
| This tool cannot be run on live metadata. | ||||
|  | ||||
| .SH OPTIONS | ||||
| .IP "\fB\-q, \-\-quiet\fP" | ||||
| Suppress output messages, return only exit code. | ||||
|   | ||||
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