Fix javadoc errors

Author: leerho

src/main/java/org/apache/datasketches/common/Util.java

@@ -432,7 +432,7 @@ public static long floorPowerOf2(final long n) {
   }
 
   /**
-   * This is a long integer equivalent to <i>Math.ceil(n / (double)(1 << k))</i>
+   * This is a long integer equivalent to <i>Math.ceil(n / (double)(1 &lt;&lt; k))</i>
    * where: <i>0 &lt; k &le; 6</i> and <i>n</i> is a non-negative long.
    * These limits are not checked for speed reasons.
    * @param n the input dividend as a positive long greater than zero.

src/main/java/org/apache/datasketches/hll/package-info.java

@@ -147,7 +147,7 @@
  * arXiv 1708.06839, August 22, 2017, Yahoo Research.
  *
  * <p>[5] MemorySegment Component, See
- * <a href="https://openjdk.org/jeps/454"><i>JEP 454: Foreign Function & Memory API</i></a>
+ * <a href="https://openjdk.org/jeps/454"><i>JEP 454: Foreign Function And Memory API</i></a>
  *
  * <p>[6] MacBook Pro 2.3 GHz 8-Core Intel Core i9
  *