fix: allow a tab or end of input after a type 6 html block tag name

the type 6 html block start only accepted spaces, a newline, > or /> after the tag name. commonmark 0.31.2 also allows a tab and the end of the line, which includes the end of the input.

test/specs/new/html_block_tab_after_tag_name.html

@@ -0,0 +1,15 @@
+<div	class="x">
+*stays raw*
+</div>
+<TABLE	class="x"><tr><td>
+*stays raw*
+</td></tr></TABLE>
+<div	
+class="x">
+*stays raw*
+</div>
+<blockquote>
+<div	class="x">
+*stays raw*
+</div>
+</blockquote>

test/specs/new/html_block_tab_after_tag_name.md

@@ -0,0 +1,16 @@
+<div	class="x">
+*stays raw*
+</div>
+
+<TABLE	class="x"><tr><td>
+*stays raw*
+</td></tr></TABLE>
+
+<div	
+class="x">
+*stays raw*
+</div>
+
+> <div	class="x">
+> *stays raw*
+> </div>

test/specs/new/html_block_tag_at_end_of_input.html

@@ -0,0 +1,2 @@
+<p>Paragraph</p>
+<div

test/specs/new/html_block_tag_at_end_of_input.md

@@ -0,0 +1,3 @@
+Paragraph
+
+<div