Remove comment which no longer applies

Author: eregon

src/main/java/org/truffleruby/parser/YARPTranslatorDriver.java

@@ -90,7 +90,6 @@
 
 public final class YARPTranslatorDriver {
 
-    /** May be null, see {@link ParserCache#parse} */
     private final RubyContext context;
     private final RubyLanguage language;
     private ParseEnvironment parseEnvironment;