Add example for list item starting with a blank line with spaces

After implementing the changes for the 0.25 spec, all the spec tests
were green.

But I noticed that my code also counted the spaces on the first line and
required the subsequent lines to be indented accordingly. This example
catches that possible bug.

1 files changed, 12 insertions, 0 deletions

diff --git a/spec.txt b/spec.txt
index 1a4a7dc..bdaed43 100644
--- a/spec.txt
+++ b/spec.txt
@@ -4080,6 +4080,18 @@ Here are some list items that start with a blank line but are not empty:
 </ul>
 ````````````````````````````````
 
+When the list item starts with a blank line, the number of spaces
+following the list marker doesn't change the required indentation:
+
+```````````````````````````````` example
+-   
+  foo
+.
+<ul>
+<li>foo</li>
+</ul>
+````````````````````````````````
+
 
 A list item can begin with at most one blank line.
 In the following example, `foo` is not part of the list