fix test for asciidoc code annotations

So that we would have found #12441 earlier

Author: cderv

tests/docs/smoke-all/2023/01/26/asciidoc-annotated-code.qmd

@@ -4,9 +4,14 @@ format:
   asciidoc: default
 _quarto:
   tests:
-    asciidoc: default
+    asciidoc: 
+      ensureFileRegexMatches:
+        - ['\<1\> First set', 'plt\.show\(\) \<3\>']
+        - ['\+\+\<\+\+1\+\+\>\+\+']
 ---
 
+This also covers https://github.com/quarto-dev/quarto-cli/issues/12441
+
 ## Annotated Code
 
 ```python