Small typos in tutorial

[anpendyal]

I found some small typos in the Mellea tutorial:

1. Chapter 6 > Training the aLORA Adapter > Parameters: "While training adapters, you can easily tuning the hyper-parameters as below:"
2. Chapter 8 > Guarded Nondeterminism: "We'll also add a decorator for convienance:"
3. Chapter 9 > Running Mellea programs as an openai compatible server (Experimental): "We also provide an expiermental m serve utility for serving up an OpenAI-compatible chat endpoint. This allows you to write m programs that masquerade as a "model"."
4. Appendix > Contributor Guide: Requirements and Verifiers: "If you write a Requirement that is general-purose and likely useful to others, consider contributing your general-purpose component to Mellea's standard library:"