[CB] remove reference to outdated fms feature branch

[yannicks1]

[CB] remove reference to outdated fms feature branch

paged_attn_mock branch of fms is no longer needed and API on main supports both, static and continuous batching simultaneously #162

[github-actions]

👋 Hi! Thank you for contributing to vLLM support on Spyre.
Just a reminder: Make sure that your code passes all the linting checks, otherwise your PR won't be able to be merged. To do so, first install the linting requirements, then run format.sh and commit the changes. This can be done with uv directly:

uv sync --frozen --group lint --active --inexact

Or this can be done with pip:

uv pip compile --group lint > requirements-lint.txt
pip install -r requirements-lint.txt
bash format.sh

Now you are good to go 🚀

[prashantgupta24]

Good catch!