Fix QuotePara

nostarch/chapter06.md

@@ -278,11 +278,17 @@ two states: null or not-null.
 In his 2009 presentation “Null References: The Billion Dollar Mistake,” Tony
 Hoare, the inventor of null, has this to say:
 
-
-Unmatched: QuotePara
-      The problem with null values is that if you try to use a null value as a
-not-null value, you’ll get an error of some kind. Because this null or not-null
-property is pervasive, it’s extremely easy to make this kind of error.
+> I call it my billion-dollar mistake. At that time, I was designing the first
+comprehensive type system for references in an object-oriented language. My
+goal was to ensure that all use of references should be absolutely safe, with
+checking performed automatically by the compiler. But I couldn’t resist the
+temptation to put in a null reference, simply because it was so easy to
+implement. This has led to innumerable errors, vulnerabilities, and system
+crashes, which have probably caused a billion dollars of pain and damage in the
+last forty years.The problem with null values is that if you try to use a null
+value as a not-null value, you’ll get an error of some kind. Because this null
+or not-null property is pervasive, it’s extremely easy to make this kind of
+error.
 
 However, the concept that null is trying to express is still a useful one: a
 null is a value that is currently invalid or absent for some reason.

tools/docx-to-md.xsl

@@ -215,7 +215,7 @@
         <xsl:text>&#10;&#10;</xsl:text>
     </xsl:template>
 
-    <xsl:template match="w:p[w:pPr/w:pStyle[@w:val = 'BlockQuote']]">
+    <xsl:template match="w:p[w:pPr/w:pStyle[@w:val = 'BlockQuote' or @w:val = 'QuotePara']]">
         <xsl:text>> </xsl:text>
         <xsl:apply-templates select="*" />
     </xsl:template>