Kyle Evans 55ece394c2 bectl(8): add description for create subcommand
In commit r345845, a portion of documentation for the create subcommand was
removed. Specifically, for creating a snapshot of an existing boot
environment. bectl even has a test-case for this functionality.

Removing the sub-command description was discussed in PR 235850.

This patch brings back the second "create" description that was originally
in place. Albeit, with a few wording/clarifying changes.

Submitted by:	Rob Fairbanks <rob.fx907 gmail com>
Reviewed by:	kevans
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D20249
2019-05-22 23:07:40 +00:00
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