the wiki “RocksJava-Basics” should be updated

The wiki says that column family handles need to be closed before freeing the db, but in reality, CF will be closed when DB is closed:

```java
public void close() {
for (final ColumnFamilyHandle columnFamilyHandle : ownedColumnFamilyHandles) {
columnFamilyHandle.close();
}
ownedColumnFamilyHandles.clear();

if (owningHandle_.compareAndSet(true, false)) {
try {
closeDatabase(nativeHandle_);
} catch (final RocksDBException e) {
// silently ignore the error report
} finally {
disposeInternal();
}
}
}
```

```java
import org.rocksdb.RocksDB;
import org.rocksdb.Options;
...
// a static method that loads the RocksDB C++ library.
RocksDB.loadLibrary();

try (final ColumnFamilyOptions cfOpts = new ColumnFamilyOptions().optimizeUniversalStyleCompaction()) {

// list of column family descriptors, first entry must always be default column family
final List cfDescriptors = Arrays.asList(
new ColumnFamilyDescriptor(RocksDB.DEFAULT_COLUMN_FAMILY, cfOpts),
new ColumnFamilyDescriptor("my-first-columnfamily".getBytes(), cfOpts)
);

// a list which will hold the handles for the column families once the db is opened
final List columnFamilyHandleList =
new ArrayList<>();

try (final DBOptions options = new DBOptions()
.setCreateIfMissing(true)
.setCreateMissingColumnFamilies(true);
final RocksDB db = RocksDB.open(options,
"path/to/do", cfDescriptors,
columnFamilyHandleList)) {

try {

// do something

} finally {

// NOTE frees the column family handles before freeing the db
for (final ColumnFamilyHandle columnFamilyHandle :
columnFamilyHandleList) {
columnFamilyHandle.close();
}
} // frees the db and the db options
}
} // frees the column family options
...
```