Route/Part: document current_notes and update regular_notes documentation

	for my $part ( $route->parts ) {

		if ( $part->extra ) {

			say join( "\n", $part->extra );

		if ( $part->regular_notes ) {

			say join( "\n", $part->regular_notes );

		}

		if ( $part->current_notes ) {

			say join( "\n", map [ $_->{summary} ] $part->current_notes );

		}

		printf(

List of URLs, may be empty. Each URL points to an HTML map of the arrival

station.

=item $part->current_notes

(NOT STABLE YET - return value may be changed without notice)

Remarks about unscheduled changes to the line serving this connaction part,

such as cancelled stops. Most times, the EFA service does not include this

information in its route calculations.

Returns a list of hashes. Each hash has the keys

summary, subject, subtitle and content. The former three return text strings,

while content returns HTML (also as a string).

=item $part->delay

delay in minutes, 0 if unknown

List of URLs, may be empty. Each URL poinst to an HTML map of the departure

station.

=item $part->extra

=item $part->regular_notes

Additional information about the connection.  Returns a list of

newline-terminated strings

Remarks about the line serving this connaction part. Returns a list of

strings.

=item $part->train_destination