Javadoc: Use the semantic "code" HTML tag instead of "tt" style tag

Author: garydgregory

src/main/java/org/apache/commons/collections4/map/ConcurrentReferenceHashMap.java

@@ -698,8 +698,8 @@ static <K, V> Segment<K, V>[] newArray(final int i) {
         private transient int modCount;
 
         /**
-         * The table is rehashed when its size exceeds this threshold. (The value of this field is always <tt>(int)(capacity *
-         * loadFactor)</tt>.)
+         * The table is rehashed when its size exceeds this threshold. (The value of this field is always <code>(int)(capacity *
+         * loadFactor)</code>.)
          */
         private transient int threshold;