Add clarification comments

Author: simonvbrae

src/N3Parser.js

@@ -25,7 +25,9 @@ export default class N3Parser {
         isLineMode = isNTriples || isNQuads;
     if (!(this._supportsNamedGraphs = !(isTurtle || isN3)))
       this._readPredicateOrNamedGraph = this._readPredicate;
+    // Support triples in other graphs
     this._supportsQuads = !(isTurtle || isTriG || isNTriples || isN3);
+    // Support nesting of triples
     this._supportsRDFStar = format === '' || /star|\*$/.test(format);
     // Disable relative IRIs in N-Triples or N-Quads mode
     if (isLineMode)