docs: miscellaneous small fixes (#961)

- **[docs] Fix misc typos and formatting issues in intro docs**
- **[docs]: Export variables (e.g. INFERENCE_MODEL) in getting_started**
- **[docs] Show that `llama-stack-client configure` will ask for api
key**

# What does this PR do?

Miscellaneous fixes in the documentation; not worth reporting an issue.

## Test Plan

No code changes. Addressed issues spotted when walking through the
guide.
Confirmed locally.

## Sources

Please link relevant resources if necessary.

## Before submitting

- [x] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [x] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

---------

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>

docs/source/distributions/self_hosted_distro/ollama.md

@@ -25,7 +25,9 @@ The `llamastack/distribution-ollama` distribution consists of the following prov
 | vector_io | `inline::faiss`, `remote::chromadb`, `remote::pgvector` |
 
 
-You should use this distribution if you have a regular desktop machine without very powerful GPUs. Of course, if you have powerful GPUs, you can still continue using this distribution since Ollama supports GPU acceleration.### Environment Variables
+You should use this distribution if you have a regular desktop machine without very powerful GPUs. Of course, if you have powerful GPUs, you can still continue using this distribution since Ollama supports GPU acceleration.
+
+### Environment Variables
 
 The following environment variables can be configured: