Document the message header fields:

- votes
- priority
- delivery_attempts

src/sbbs3/js_msgbase.c

@@ -3146,6 +3146,10 @@ static jsSyncMethodSpec js_msgbase_functions[] = {
 	"<tr><td align=top><tt>thread_back</tt><td>Message number that this message is a reply to"
 	"<tr><td align=top><tt>thread_next</tt><td>Message number of the next reply to the original message in this thread"
 	"<tr><td align=top><tt>thread_first</tt><td>Message number of the first reply to this message"
+	"<tr><td align=top><tt>votes</tt><td>Bit-field of votes if ballot, maximum allowed votes per ballot if poll"
+	"<tr><td align=top><tt>priority</tt><td>Priority value following the <i>X-Priority</i> email header schcme "
+		"(1 = highest, 3 = normal, 5 = lowest, 0 = unspecified)"
+	"<tr><td align=top><tt>delivery_attempts</tt><td>Number of failed delivery attempts (e.g. over SMTP)"
 	"<tr><td align=top><tt>field_list[].type</tt><td>Other SMB header fields (type)"
 	"<tr><td align=top><tt>field_list[].data</tt><td>Other SMB header fields (data)"
 	"<tr><td align=top><tt>can_read</tt><td>true if the current user can read this validated or unmoderated message"