[PATCH] Fix a typo in svn-ref.xml

[wuzhouhui]

> On Feb 27, 2019, at 11:53 PM, C. Michael Pilato <cmpilato at red-bean.com> wrote:
> 
> Oops!  Good catch.  Please commit.
Committed in r5893
> 
> On Wed, Feb 27, 2019 at 12:15 AM wuzhouhui <wuzhouhui14 at mails.ucas.ac.cn> wrote:
> * en/book/ref-svn.xml
>   Fix a typo
> Index: trunk/en/book/ref-svn.xml
> ===================================================================
> --- trunk/en/book/ref-svn.xml   (revision 5889)
> +++ trunk/en/book/ref-svn.xml   (working copy)
> @@ -756,7 +756,7 @@
>          <term><option>--parents</option></term>
>          <listitem>
>            <para>Creates and adds nonexistent or nonversioned parent
> -            subdirectories to the working copy or repository as part
> +            directories to the working copy or repository as part
>              of an operation.  This is useful for automatically
>              creating multiple subdirectories where none currently
>              exist.  If performed on a URL, all the directories will
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