Add note about blocks and list indentation to MD029/ol-prefix.

doc/Rules.md

@@ -992,6 +992,30 @@ This rule supports 0-prefixing ordered list items for uniform indentation:
 ...
 ```
 
+Note: This rule will report violations for cases like the following where an improperly-indented code block (or similar) appears between two list items and "breaks" the list in two:
+
+~~~markdown
+1. First list
+
+```text
+Code block
+```
+
+1. Second list
+~~~
+
+The fix is to indent the code block so it becomes part of the preceding list item as intended:
+
+~~~markdown
+1. First list
+
+   ```text
+   Code block
+   ```
+
+2. Still first list
+~~~
+
 Rationale: Consistent formatting makes it easier to understand a document.
 
 <a name="md030"></a>