void addRowGroup(HtmlDocTree tree) {
		switch (tree.getHtmlKind()) {
			case THEAD:
				if (tree.getBody().size() > 1) {
					throw new UnsupportedOperationException("nested table rows are not supported");
				}
			case TBODY:
			case TFOOT:
				for (DocTree tag : tree.getBody()) {
					if (!(tag instanceof HtmlDocTree)) {
						continue;
					}
					addRow((HtmlDocTree) tag);
				}
				return;
			default:
				break;
		}
	}
Adds new row group to the table

@param tree the html tree containing the row group
@throws UnsupportedOperationException if any row in the group contains a nested row
GhidraBuild/BuildFiles/Doclets/src/main/java/ghidra/doclets/typestubs/RstTableBuilder.java