fix: some errors in available llms examples (#544)

apps/docs/docs/modules/llms/available_llms/azure.md

apps/docs/docs/modules/llms/available_llms/llama2.md

apps/docs/docs/modules/llms/available_llms/mistral.md

apps/docs/docs/modules/llms/available_llms/ollama.md

apps/docs/docs/modules/llms/available_llms/openai.md

apps/docs/docs/modules/llms/available_llms/portkey.md

apps/docs/docs/modules/llms/available_llms/together.md