Removed unsupported HTML commands from the docs

doc/htmlcmds.doc

@@ -57,8 +57,6 @@ of a HTML tag are passed on to the HTML output only
 <li><tt>\</DT\></tt>   Ends an item title.
 <li><tt>\<EM\></tt>    Starts a piece of text displayed in an italic font.
 <li><tt>\</EM\></tt>   Ends a <tt>\<EM\></tt> section.
-<li><tt>\<FORM\></tt>  Does not generate any output.
-<li><tt>\</FORM\></tt> Does not generate any output.
 <li><tt>\<HR\></tt>    Writes a horizontal ruler.
 <li><tt>\<H1\></tt>    Starts an unnumbered section.
 <li><tt>\</H1\></tt>   Ends an unnumbered section.
@@ -67,12 +65,10 @@ of a HTML tag are passed on to the HTML output only
 <li><tt>\<H3\></tt>    Starts an unnumbered subsubsection.
 <li><tt>\</H3\></tt>   Ends an unnumbered subsubsection.
 <li><tt>\<I\></tt>     Starts a piece of text displayed in an italic font.
-<li><tt>\<INPUT\></tt> Does not generate any output.
 <li><tt>\</I\></tt>    Ends a <tt>\<I\></tt> section.
 <li><tt>\<IMG\></tt>   This command is written with attributes to the HTML output only.
 <li><tt>\<LI\></tt>    Starts a new list item.
 <li><tt>\</LI\></tt>   Ends a list item.
-<li><tt>\<META\></tt>  Does not generate any output.
 <li><tt>\<MULTICOL\></tt> ignored by doxygen.
 <li><tt>\</MUTLICOL\></tt> ignored by doxygen.
 <li><tt>\<OL\></tt>    Starts a numbered item list.