docs: update index.md for 0.1.2 (#1013)

# What does this PR do?
[Provide a short summary of what this PR does and why. Link to relevant
issues if applicable.]

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)
[//]: # (- [ ] Added a Changelog entry if the change is significant)

docs/source/index.md

@@ -2,7 +2,7 @@
 ```{admonition} News
 :class: tip
 
-Llama Stack 0.1.1 is now available! See the [release notes](https://github.com/meta-llama/llama-stack/releases/tag/v0.1.1) for more details.
+Llama Stack 0.1.2 is now available! See the [release notes](https://github.com/meta-llama/llama-stack/releases/tag/v0.1.2) for more details.
 ```
 
 # Llama Stack