More UXR fixes

Author: hengtaoguo

docs/tutorials/posttraining/rl_on_multi_host.md

@@ -93,7 +93,7 @@ You can install the required dependencies using either of the following two opti
 ### Option 1: Installing stable releases of tunix and vllm-tpu
 Run the following bash script to create a docker image with all the dependencies of MaxText, Tunix, vLLM and tpu-inference installed.
 
-In addition to MaxText dependencies, primarily, it installs `vllm-tpu` which is [vllm](https://github.com/vllm-project/vllm) and [tpu-inference](https://github.com/vllm-project/tpu-inference) and thereby providing TPU inference for vLLM, with unified JAX and PyTorch support.
+In addition to MaxText dependencies, primarily, it installs `vllm-tpu` which is [vllm](https://github.com/vllm-project/vllm) and [tpu-inference](https://github.com/vllm-project/tpu-inference) and thereby providing TPU inference for vLLM, with unified JAX and PyTorch support. This build process takes approximately 10 to 15 minutes.
 
 ```
 bash dependencies/scripts/docker_build_dependency_image.sh MODE=post-training

docs/tutorials/posttraining/sft_on_multi_host.md

@@ -43,7 +43,7 @@ gcloud auth application-default login
 gcloud auth configure-docker
 docker run hello-world
 ```
-Then run the following command to create a local Docker image named `maxtext_base_image`.
+Then run the following command to create a local Docker image named `maxtext_base_image`. This build process takes approximately 10 to 15 minutes.
 ```bash
 bash dependencies/scripts/docker_build_dependency_image.sh MODE=post-training
 ```