Add a sentence to the svnadmin Subcommand Reference.
Add a sentence to the svnadmin Subcommand Reference.

* doc/book/book/ch09.xml:
  Explicitly state that svnadmin hotcopy is safe to run on a live repository
  that is being accessed by other processes.  The wording is taken almost
  exactly from chapter 5.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@850042 13f79535-47bb-0310-9956-ffa450edef68

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