Elaborate on wrapping styles

guidelines/markdown.md

 Generic
 -------
 
- *  Wrap at 75 columns at most (*fmt(1)* default).  Wrapping to less can
-    be beneficial (e.g. for re-quoting or in block comments) but less
-    than 61 is not considered sane.
+ *  Wrap at 75 columns at most (*fmt(1)* default).
+
+ *  Wrapping documents to less can be beneficial (e.g. for re-quoting).
+
+ *  Some lists, code blocks or blockquotes may look better wrapped
+    to less than surrounding paragraphs, i.e. to "make up" for the
+    left indentation.  (This is most apparent in case of medium-sized
+    list/block between paragraphs.)
 
  *  Try to have 2 spaces after sentence.