doc: Use HTML 5 for asciidoc/markdown generated HTML

Asciidoc or Markdown to HTML processors all generate valid HTML 5 code, but not valid HTML 4 code.
JMRI · Feb 29, 2020 · e4fddfc · e4fddfc
1 parent bf3fca9
commit e4fddfc
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Showing 2 changed files with 2 additions and 4 deletions.
diff --git a/help/en/html/doc/Technical/AppPreferences.shtml b/help/en/html/doc/Technical/AppPreferences.shtml
@@ -1,5 +1,4 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
-    "http://www.w3.org/TR/html4/strict.dtd">
+<!DOCTYPE html>
 
 <html lang="en">
 <head>

diff --git a/help/en/html/doc/Technical/NetBeans.shtml b/help/en/html/doc/Technical/NetBeans.shtml
@@ -1,5 +1,4 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-    "http://www.w3.org/TR/html4/loose.dtd">
+<!DOCTYPE html>
 
 <html lang="en">
     <head>