Revert "Docs: Hide null return types."

This reverts commit fca1c627.

docs/page.js

@@ -61,7 +61,6 @@ function onDocumentLoad( event ) {
 
 	text = text.replace( /\[(member|property|method|param):([\w]+)\]/gi, "[$1:$2 $2]" ); // [member:name] to [member:name title]
 	text = text.replace( /\[(?:member|property|method):([\w]+) ([\w\.\s]+)\]\s*(\(.*\))?/gi, "<a onclick=\"window.parent.setUrlFragment('" + name + ".$2')\" target=\"_parent\" title=\"" + name + ".$2\" class=\"permalink\">#</a> .<a onclick=\"window.parent.setUrlFragment('" + name + ".$2')\" id=\"$2\">$2</a> $3 : <a class=\"param\" onclick=\"window.parent.setUrlFragment('$1')\">$1</a>" );
-	text = text.replace( / : <a class="param" onclick="window.parent.setUrlFragment\('\w+'\)">null<\/a>/gi, '' ); // remove null return types
 	text = text.replace( /\[param:([\w\.]+) ([\w\.\s]+)\]/gi, "$2 : <a class=\"param\" onclick=\"window.parent.setUrlFragment('$1')\">$1</a>" ); // [param:name title]
 
 	text = text.replace( /\[link:([\w|\:|\/|\.|\-|\_]+)\]/gi, "[link:$1 $1]" ); // [link:url] to [link:url title]
@@ -71,7 +70,7 @@ function onDocumentLoad( event ) {
 	text = text.replace( /\[example:([\w\_]+)\]/gi, "[example:$1 $1]" ); // [example:name] to [example:name title]
 	text = text.replace( /\[example:([\w\_]+) ([\w\:\/\.\-\_ \s]+)\]/gi, "<a href=\"../examples/#$1\"  target=\"_blank\">$2</a>" ); // [example:name title]
 
-	text = text.replace( /<a class="param" onclick="window.parent.setUrlFragment\('\w+'\)">(Boolean|Object|Array|Number|String|Integer|Float|TypedArray|ArrayBuffer)<\/a>/gi, '<span class="param">$1</span>' ); // remove links to primitive types
+	text = text.replace( /<a class="param" onclick="window.parent.setUrlFragment\('\w+'\)">(null|Boolean|Object|Array|Number|String|Integer|Float|TypedArray|ArrayBuffer)<\/a>/gi, '<span class="param">$1</span>' ); // remove links to primitive types
 
 	document.body.innerHTML = text;