docs:Update README to use --enableSnappy flag to import snappy compre… (

#3623)

…ssed snapshots.

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/java-bigtable-hbase/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> ☕️

If you write sample code, please follow the [samples format](
https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md).

bigtable-dataflow-parent/bigtable-beam-import/README.md

@@ -103,7 +103,7 @@ Exporting HBase snapshots from Bigtable is not supported.
     ```
 1. Run the export.
    ```
-   java -jar bigtable-beam-import-2.0.0.jar export \
+   java -jar bigtable-beam-import-2.3.0.jar export \
         --runner=dataflow \
         --project=$PROJECT_ID \
         --bigtableInstanceId=$INSTANCE_ID \
@@ -143,15 +143,15 @@ Please pay attention to the Cluster CPU usage and adjust the number of Dataflow
 
 1. Run the import.
     ```
-    java -jar bigtable-beam-import-2.0.0.jar importsnapshot \
+    java -jar bigtable-beam-import-2.3.0.jar importsnapshot \
         --runner=DataflowRunner \
         --project=$PROJECT_ID \
         --bigtableInstanceId=$INSTANCE_ID \
         --bigtableTableId=$TABLE_NAME \
         --hbaseSnapshotSourceDir=$SNAPSHOT_GCS_PATH/data \
         --snapshotName=$SNAPSHOT_NAME \
         --stagingLocation=$SNAPSHOT_GCS_PATH/staging \
-        --tempLocation=$SNAPSHOT_GCS_PATH/temp \
+        --gcpTempLocation=$SNAPSHOT_GCS_PATH/temp \
         --maxWorkerNodes=$(expr 3 \* $CLUSTER_NUM_NODES) \
         --region=$REGION
     ```
@@ -171,19 +171,18 @@ Please pay attention to the Cluster CPU usage and adjust the number of Dataflow
 
 1. Run the import.
     ```
-    java -jar bigtable-beam-import-2.0.0.jar importsnapshot \
+    java -jar bigtable-beam-import-2.3.0.jar importsnapshot \
         --runner=DataflowRunner \
         --project=$PROJECT_ID \
         --bigtableInstanceId=$INSTANCE_ID \
         --bigtableTableId=$TABLE_NAME \
         --hbaseSnapshotSourceDir=$SNAPSHOT_GCS_PATH/data \
         --snapshotName=$SNAPSHOT_NAME \
         --stagingLocation=$SNAPSHOT_GCS_PATH/staging \
-        --tempLocation=$SNAPSHOT_GCS_PATH/temp \
+        --gcpTempLocation=$SNAPSHOT_GCS_PATH/temp \
         --maxWorkerNodes=$(expr 3 \* $CLUSTER_NUM_NODES) \
         --region=$REGION \
-        --experiments=use_runner_v2 \
-        --sdkContainerImage=gcr.io/cloud-bigtable-ecosystem/unified-harness:latest
+        --enableSnappy=true
     ```
 
 ### Sequence Files
@@ -200,7 +199,7 @@ Please pay attention to the Cluster CPU usage and adjust the number of Dataflow
     ```
 1. Run the import.
     ```
-    java -jar bigtable-beam-import-2.0.0.jar import \
+    java -jar bigtable-beam-import-2.3.0.jar import \
         --runner=dataflow \
         --project=$PROJECT_ID \
         --bigtableInstanceId=$INSTANCE_ID \
@@ -228,7 +227,7 @@ check if there are any rows with mismatched data.
     ```
 1. Run the sync job. It will put the results into `$SNAPSHOT_GCS_PATH/data-verification/output-TIMESTAMP`. 
     ```
-    java -jar bigtable-beam-import-2.0.0.jar sync-table  \
+    java -jar bigtable-beam-import-2.3.0.jar sync-table  \
         --runner=dataflow \
         --project=$PROJECT_ID \
         --bigtableInstanceId=$INSTANCE_ID \