add megatron training doc

update toc

add images

update formatting and wording

formatting

update formatting

update conf.py

update formatting

update docker img

tweak formatting

Fix stuff

fix mock-data/data-path

add specific commit hash to checkout

update docker pull tag

fix docker run cmd and examples path

fix docker cmd

docs/sphinx/_toc.yml.in

@@ -40,6 +40,8 @@ subtrees:
         title: Installation
       - file: how-to/rocm-for-ai/train-a-model.rst
         title: Train a model
+      - file: how-to/rocm-for-ai/accelerate-training.rst
+        title: Accelerate training
       - file: how-to/rocm-for-ai/hugging-face-models.rst
         title: Run models from Hugging Face
       - file: how-to/rocm-for-ai/deploy-your-model.rst