Update test/spec.txt

Author: jgm

test/spec.txt

@@ -328,8 +328,10 @@ that is not a [whitespace character].
 
 An [ASCII punctuation character](@)
 is `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`,
-`*`, `+`, `,`, `-`, `.`, `/`, `:`, `;`, `<`, `=`, `>`, `?`, `@`,
-`[`, `\`, `]`, `^`, `_`, `` ` ``, `{`, `|`, `}`, or `~`.
+`*`, `+`, `,`, `-`, `.`, `/` (U+0021–2F), 
+`:`, `;`, `<`, `=`, `>`, `?`, `@` (U+003A–0040),
+`[`, `\`, `]`, `^`, `_`, `` ` `` (U+005B–0060), 
+`{`, `|`, `}`, or `~` (U+007B–007E).
 
 A [punctuation character](@) is an [ASCII
 punctuation character] or anything in
@@ -2005,15 +2007,15 @@ Closing code fences cannot have [info strings]:
 An [HTML block](@) is a group of lines that is treated
 as raw HTML (and will not be escaped in HTML output).
 
-There are seven kinds of [HTML block], which can be defined
-by their start and end conditions.  The block begins with a line that
-meets a [start condition](@) (after up to three spaces
-optional indentation).  It ends with the first subsequent line that
-meets a matching [end condition](@), or the last line of
-the document or other [container block](#container-blocks)), if no
-line is encountered that meets the [end condition].  If the first line
-meets both the [start condition] and the [end condition], the block
-will contain just that line.
+There are seven kinds of [HTML block], which can be defined by their
+start and end conditions.  The block begins with a line that meets a
+[start condition](@) (after up to three spaces optional indentation).
+It ends with the first subsequent line that meets a matching [end
+condition](@), or the last line of the document, or the last line of
+the [container block](#container-blocks) containing the current HTML
+block, if no line is encountered that meets the [end condition].  If
+the first line meets both the [start condition] and the [end
+condition], the block will contain just that line.
 
 1.  **Start condition:**  line begins with the string `<script`,
 `<pre`, or `<style` (case-insensitive), followed by whitespace,
@@ -2052,9 +2054,9 @@ the string `/>`.\
 **End condition:** line is followed by a [blank line].
 
 7.  **Start condition:**  line begins with a complete [open tag]
-or [closing tag] (with any [tag name] other than `script`,
-`style`, or `pre`) followed only by [whitespace]
-or the end of the line.\
+(with any [tag name] other than `script`,
+`style`, or `pre`) or a complete [closing tag],
+followed only by [whitespace] or the end of the line.\
 **End condition:** line is followed by a [blank line].
 
 HTML blocks continue until they are closed by their appropriate
@@ -9546,7 +9548,7 @@ closers:
     of the delimiter stack.  If the closing node is removed, reset
     `current_position` to the next element in the stack.
 
-- If none in found:
+- If none is found:
 
   + Set `openers_bottom` to the element before `current_position`.
     (We know that there are no openers for this kind of closer up to and