Various updates to CHANGELOG.txt in preparation for the 7.33 release.

CHANGELOG.txt

@@ -30,10 +30,13 @@ Drupal 7.33, xxxx-xx-xx (development version)
   not do anything when it was invoked.
 - Added a "theme_hook_original" variable to templates and theme functions and
   an optional sitewide theme debug mode, to provide contextual information in
-  the page's HTML to theme developers (API addition).
+  the page's HTML to theme developers. The theme debug mode is based on the one
+  used with Twig in Drupal 8 and can be accessed by setting the "theme_debug"
+  variable to TRUE (API addition).
 - Added an entity_view_mode_prepare() API function to allow entity-defining
   modules to properly invoke hook_entity_view_mode_alter(), and used it
-  throughout Drupal core to fix bugs with the invocation of that hook.
+  throughout Drupal core to fix bugs with the invocation of that hook (API
+  change: https://www.drupal.org/node/2369141).
 - Security improvement: Made the database API's orderBy() method sanitize the
   sort direction ("ASC" or "DESC") for queries built with db_select(), so that
   calling code does not have to.
@@ -54,6 +57,9 @@ Drupal 7.33, xxxx-xx-xx (development version)
   hook_query_alter() on these queries).
 - Removed special-case behavior for file uploads which allowed user #1 to
   bypass maximum file size and user quota limits.
+- Numerous small bug fixes.
+- Numerous API documentation improvements.
+- Additional automated test coverage.
 
 Drupal 7.32, 2014-10-15
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