EAGLESIX-5473: markdown: fix $sort w/ $limit

lib/extras/markdown.js

@@ -178,7 +178,7 @@ function toListItem(str, i) {
 
 		documentSources.SortDocumentSource.prototype.getMarkdown = function(level) {
 			var indent = getIndentStr(level),
-				str = indent + "sort docs by:\n";
+				str = indent + (this.limitSrc ? "sort docs by (keeping only " + this.limitSrc.getLimit() + "):\n" : "sort docs by:\n");
 			for (var i = 0, l = this.vSortKey.length; i < l; i++) {
 				var orderStr = this.vAscending[i] ? "in order" : "in reverse order";
 				str += indent + INDENT_STR + i + ". " + this.vSortKey[i].getMarkdown().trimRight() + ", " + orderStr;