mdscrub: residual html, control characters, headings, page markers

parity/cases/mdscrub/breaks.md

@@ -0,0 +1,5 @@
+The address was set with explicit line breaks:<br>Twelve Mill Lane<br/>The
+Valley<br />and the county beyond.
+
+A second paragraph, where the break sits mid sentence — the mill stood at
+the<br>northern end of the valley, where the fall was steepest.