better callout at top, fix an src usage

Author: hjwp

chapter_09_docker.asciidoc

@@ -46,14 +46,17 @@ if that's what it takes to convince you it's worth it.
 *******************************************************************************
 As part of my work on the third edition of the book,
 I'm rewriting the deployment chapters,
-and this chapter is still a very rough draft I'm afraid.
+and this chapter is still an early draft I'm afraid.
 Sorry!
 
-Following along with this chapter is going to be pretty tricky
-in its current state, although you might be able to skim
-through the content out of curiosity.
+Still, the broad outline is complete, so I'd love it if you had a go at following along!
 
-It might be best to skip ahead to <<chapter_12_organising_test_files>>
+Most importantly, please please send your feedback to [email protected],
+or as a https://github.com/hjwp/Book-TDD-Web-Dev-Python/issues[GitHub Issue]
+
+The next two chapters are even more rough, so if you prefer,
+you are welcome to skip all the deployment stuff and go straight to
+<<chapter_12_organising_test_files>>
 
 *******************************************************************************
 
@@ -209,7 +212,8 @@ How will containerizing our software help with the danger areas?
   and we've tested both those things, then we will have
   minimised the risk of deployment to production.
 
-TODO: consider getting rid of the staging server??
+// TODO: consider getting rid of the staging server??
+
 
 ////
 footnote:[What I'm calling a "staging" server, some people would
@@ -390,7 +394,7 @@ I'll use the `--failfast` option to exit as soon as a single test fails:
 [role="small-code"]
 [subs="specialcharacters,macros"]
 ----
-$ pass:quotes[*TEST_SERVER=localhost:8888 ./src/manage.py test functional_tests \
+$ pass:quotes[*TEST_SERVER=localhost:8888 ./manage.py test functional_tests \
     --failfast*]
 [...]
 E
@@ -1282,7 +1286,7 @@ That also gives us a convenient excuse to talk about mounting files in Docker,
 which is a very useful thing to be able to do (TM).
 
 
-First let's revert our change: 
+First let's revert our change:
 
 [role="sourcecode"]
 .Dockerfile (ch09l009)