Bug 10690 - Warn about trailing slashes in description of OPACBaseURL and staffClient...

Bug 10690 - Warn about trailing slashes in description of OPACBaseURL and staffClientBaseURL

The descriptions for OPACBaseURL and staffClientBaseURL are not explicit
about including a trailing slash or not. This patch makes it explicit
that the trailing slash should *not* be included.

To test:
- Apply the patch
- Search for "baseurl" in the system preferences
- Check that the description of both sysprefs includes a warning about
  not including a trailing slash.
- Sign off

If you want to check that the trailing slash is in fact superfluous you
can do something like 'grep -r "BaseURL" *' and check that these
sysprefs are usually concatenated with some string that starts with a
slash.

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Changes to the description appear correctly on both system
preferences.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>