Add comments about SQLite3 changes to UPGRADING

Author: bohwaz

UPGRADING

@@ -68,6 +68,11 @@ PHP 8.3 UPGRADE NOTES
 4. Deprecated Functionality
 ========================================
 
+- SQLite3
+  . Using exceptions is now preferred, warnings will be removed in the future.
+    Calling SQLite3::enableExceptions(false) will trigger a depreciation warning
+    in this version.
+
 ========================================
 5. Changed Functions
 ========================================
@@ -192,6 +197,12 @@ PHP 8.3 UPGRADE NOTES
 9. Other Changes to Extensions
 ========================================
 
+- SQLite3
+  . The SQLite3 class now throws \SQLite3Exception (extends \Exception) instead
+    of \Exception.
+  . The SQLite error code is now passed in the exception error code instead of being
+    included in the error message.
+
 ========================================
 10. New Global Constants
 ========================================