Update CHANGES and UPGRADE.txt for 18.11.2

CHANGES

@@ -12,6 +12,18 @@
 ===
 ==============================================================================
 
+------------------------------------------------------------------------------
+--- Functionality changes from Asterisk 18.11.1 to Asterisk 18.11.2 ----------
+------------------------------------------------------------------------------
+
+func_odbc
+------------------
+ * A SQL_ESC_BACKSLASHES dialplan function has been added which
+   escapes backslashes. Usage of this is dependent on whether the
+   database in use can use backslashes to escape ticks or not. If
+   it can, then usage of this prevents a broken SQL query depending
+   on how the SQL query is constructed.
+
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 18.10.0 to Asterisk 18.11.0 ----------
 ------------------------------------------------------------------------------

doc/CHANGES-staging/func_odbc_esc_backslashes.txt

-Subject: func_odbc
-
-A SQL_ESC_BACKSLASHES dialplan function has been added which
-escapes backslashes. Usage of this is dependent on whether the
-database in use can use backslashes to escape ticks or not. If
-it can, then usage of this prevents a broken SQL query depending
-on how the SQL query is constructed.