Fix javadoc

jvector-base/src/main/java/io/github/jbellis/jvector/pq/PQVectors.java

@@ -173,7 +173,7 @@ public void write(DataOutput out, int version) throws IOException
     }
 
     /**
-     * @return the number of chunks that have actually been allocated (<= compressedDataChunks.length)
+     * @return the number of chunks that have actually been allocated ({@code <= compressedDataChunks.length})
      */
     protected abstract int validChunkCount();