fix chapter update warnings

Author: hjwp

chapter_19_mocking.asciidoc

@@ -3,7 +3,12 @@
 
 .Warning, Chapter Under Construction.
 *******************************************************************************
-🚧 Warning, this Chapter is in the process of being updated for the third edition.
+🚧 Warning, this Chapter is freshly updated for Django 4 + Python 3.12.
+
+The code listings should have valid syntax,
+and I've been through and sense-checked the chapter text,
+but a few things might still be off!
+So let me know what you think of the chapter, via [email protected]
 
 *******************************************************************************
 

chapter_server_side_debugging.asciidoc

@@ -2,6 +2,20 @@
 Server-Side Debugging
 ---------------------
 
+.Warning, Chapter Not Updated.
+*******************************************************************************
+🚧 Warning, this Chapter is the 2e version, and uses Django 1.11
+
+This chapter and all the following ones are the second edition versions, so they still use Django 1.11, Python 3.8, and so on.
+
+To follow along with this chapter, it’s probably easiest to reset your code to match my example code as it was in the 2e, by resetting to: https://github.com/hjwp/book-example/tree/chapter_19_mocking
+
+And you should also probably delete and re-create your virtualenv with * Python 3.8 or 3.9 * and Django 1.11 (pip install "django <2")
+
+Alternatively, you can muddle through and try and figure out how to make things work with Django 4 etc, but be aware that the listings below won’t be quite right.
+*******************************************************************************
+
+
 Popping a few layers off the stack of things we're working on: we have nice
 wait-for helpers; what were we using them for?  Oh yes, waiting to be logged
 in. And why was that?  Ah yes, we had just built a way of pre-authenticating