8252937: Correct "no comment" warnings from javadoc in java.math package

Reviewed-by: darcy

Author: Brian Burkhalter

src/java.base/share/classes/java/math/BigDecimal.java

@@ -4208,7 +4208,9 @@ static void setIntValVolatile(BigDecimal bd, BigInteger val) {
      * Reconstitute the {@code BigDecimal} instance from a stream (that is,
      * deserialize it).
      *
-     * @param s the stream being read.
+     * @param  s the stream being read.
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
      */
     @java.io.Serial
     private void readObject(java.io.ObjectInputStream s)
@@ -4227,7 +4229,8 @@ private void readObject(java.io.ObjectInputStream s)
    /**
     * Serialize this {@code BigDecimal} to the stream in question
     *
-    * @param s the stream to serialize to.
+    * @param  s the stream to serialize to.
+    * @throws IOException if an I/O error occurs
     */
     @java.io.Serial
    private void writeObject(java.io.ObjectOutputStream s)

src/java.base/share/classes/java/math/BigInteger.java

@@ -4657,6 +4657,10 @@ private int firstNonzeroIntNum() {
      * marker value. Therefore, no explicit action to set these fields needs to
      * be taken in readObject because those fields already have a 0 value by
      * default since defaultReadObject is not being used.
+     *
+     * @param  s the stream being read.
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
      */
     @java.io.Serial
     private void readObject(java.io.ObjectInputStream s)
@@ -4724,6 +4728,9 @@ static void putMag(BigInteger bi, int[] magnitude) {
      * {@code firstNonzeroByteNum}, respectively.  These values are compatible
      * with older implementations, but will be ignored by current
      * implementations.
+     *
+     * @param  s the stream to serialize to.
+     * @throws IOException if an I/O error occurs
      */
     @java.io.Serial
     private void writeObject(ObjectOutputStream s) throws IOException {

src/java.base/share/classes/java/math/MathContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -308,7 +308,9 @@ public java.lang.String toString() {
      * Reconstitute the {@code MathContext} instance from a stream (that is,
      * deserialize it).
      *
-     * @param s the stream being read.
+     * @param  s the stream being read.
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
      */
     @java.io.Serial
     private void readObject(java.io.ObjectInputStream s)