Update HTML tags

Sources:
- https://developer.mozilla.org/en-US/docs/Web/HTML
- https://reference.codeproject.com/html/

Miscellaneous/web/html-tags.txt

@@ -56,6 +56,11 @@ form
 frame
 frameset
 h1
+h2
+h3
+h4
+h5
+h6
 head
 header
 hgroup
@@ -103,6 +108,7 @@ option
 output
 p
 param
+portal
 picture
 plaintext
 pre
@@ -116,6 +122,7 @@ ruby
 s
 samp
 script
+search
 section
 select
 set