Update README.md (#6946)

* Update README.md

Author: janasangeetha

tfx/tools/docker/README.md

@@ -1,10 +1,10 @@
-Files for building the [Docker](http://www.docker.com) image for TFX.
+Files for building the [Docker](https://hub.docker.com/r/tensorflow/tfx/tags) image for TFX.
 
 To build a docker image, run below command with flags under root directory of
-github checkout. ``` ./tfx/tools/docker/build_docker_image.sh --build-arg
-TFX_DEPENDENCY_SELECTOR=NIGHTLY --build-arg
-BASE_IMAGE=gcr.io/deeplearning-platform-release/tf2-gpu.2-13.py310 --build-arg
-BEAM_VERSION=2.50.0 --build-arg ADDITIONAL_PACKAGES=tensorflow==2.13.0
+github checkout.
+```
+./tfx/tools/docker/build_docker_image.sh  --build-arg TFX_DEPENDENCY_SELECTOR=DEFAULT
+```
 
 ```