Bug 8670 - Update POD of C4::Branch::GetBranches() to use TT syntax

Bug 8670 - Update POD of C4::Branch::GetBranches() to use TT syntax

This patch updates the example template syntax in the POD for
C4::Branch::GetBranches() to use Template Toolkit syntax.

To test, view the POD for C4::Branch::GetBranches() and confirm that it
looks correct.

Signed-off-by: Magnus Enger <magnus@enger.priv.no>
Checked the POD with "perldoc C4/Branch.pm" before and after applying
the patch. The example now uses TT syntax, and looks sensible.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>