bug 6227: tweak release notes

NoZebra is deprecated

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

misc/release_notes/release_notes_3_4_0.txt

@@ -112,6 +112,7 @@ New features in 3.4.0
     * Parameters can be set in guided reports
 
   SEARCHING
+    * NoZebra mode is officially deprecated.
     * Added shelf location to the indexes
     * Added a search link for analytics to serial records
     * Subjects can now search complete subfields