update man pages to forbid running on live metadata
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@@ -10,7 +10,8 @@ thin_delta \- Print the differences in the mappings between two thin devices.
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.SH DESCRIPTION
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.B thin_delta
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allows you to compare the mappings in two thin volumes (snapshots allow common blocks between thin volumes).
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.
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This tool cannot be run on live metadata unless the \fB\-\-metadata\-snap\fP option is used.
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.SH OPTIONS
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.IP "\fB\-\-thin1, \-\-snap1\fP"
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