8267570: The comment of the class JavacParser is not appropriate

Reviewed-by: jjg

src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java

@@ -62,11 +62,12 @@
 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndExplicitNotAllowed;
 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.VarAndImplicitNotAllowed;
 
-/** The parser maps a token sequence into an abstract syntax
- *  tree. It operates by recursive descent, with code derived
- *  systematically from an LL(1) grammar. For efficiency reasons, an
- *  operator precedence scheme is used for parsing binary operation
- *  expressions.
+/**
+ * The parser maps a token sequence into an abstract syntax tree.
+ * The parser is a hand-written recursive-descent parser that
+ * implements the grammar described in the Java Language Specification.
+ * For efficiency reasons, an operator precedence scheme is used
+ * for parsing binary operation expressions.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.