function isSectionHeader( comment ) {
	var val;
	if (
		comment.type !== 'Line' ||
		comment.loc.start.column !== 0
	) {
		return false;
	}
	val = comment.value;
	return REGEXP_HEADER.test( val ) || endsWith( val, '//' );
}
Checks whether a comment is a section header.

@private
@param {Object} comment - comment object
@returns {boolean} boolean indicating if a line comment denotes a section header