[gparted] Update comment with example LUKS_Info cache entry

[Curtis Gedak <gedakc src gnome org>]

commit e0390d9cd8b4f35b09b6a9f12becfcb7b7356b94
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sat May 20 09:15:18 2017 +0100

    Update comment with example LUKS_Info cache entry
    
    Reflect the change made to the data model in commit:
        Use BlockSpecial in LUKS_Info module cache (#767842)
        7cd574cac5f7d076ebd94795f5c6f41b333fdee7

 src/LUKS_Info.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/LUKS_Info.cc b/src/LUKS_Info.cc
index be6f739..45612bb 100644
--- a/src/LUKS_Info.cc
+++ b/src/LUKS_Info.cc
@@ -29,7 +29,7 @@ namespace GParted
 
 // Cache of active dm-crypt mappings.
 // Example entry:
-//     {name="sdb6_crypt", major=8, minor=22, path="/dev/sdb6", offset=2097152, length=534773760}
+//     {name="sdb6_crypt", container=BlockSpecial{"/dev/sdb6", 8, 22}, offset=2097152, length=534773760}
 std::vector<LUKS_Mapping> LUKS_Info::luks_mapping_cache;
 
 bool LUKS_Info::cache_initialised = false;