Python: Update 00-getting-started.ipynb (#2766)

deployment name is required instead of
kernel.add_chat_service("chat_completion",
AzureChatCompletion("gpt-35-turbo", endpoint, api_key))

Fixes #2772

### Motivation and Context

<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  For notebook to work.
  2. What problem does it solve?
  current fails with error deployment not exist.
  3. What scenario does it contribute to?
  Getting started
  7. If it fixes an open issue, please link to the issue here.
-->

### Description

<!-- Just replaced hardcoded deployment name to use deployment parameter
from .env file! -->

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

Co-authored-by: Lee Miller <lemiller@microsoft.com>

python/notebooks/00-getting-started.ipynb

@@ -88,7 +88,7 @@
     "\n",
     "deployment, api_key, endpoint = sk.azure_openai_settings_from_dot_env()\n",
     "\n",
-    "kernel.add_chat_service(\"chat_completion\", AzureChatCompletion(\"gpt-35-turbo\", endpoint, api_key))\n"
+    "kernel.add_chat_service(\"chat_completion\", AzureChatCompletion(deployment, endpoint, api_key))\n"
    ]
   },
   {