.Net: Python: Update multiple-results when streaming at a getting-sta…

…rted notebook. (#6859)

### Motivation and Context
Fix the multiple results when streaming.
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### Description
Don't use enumerate and take a choice_index which is already provided in
the result.

Expected)
Result 1: Blah Blah
Result 2: Blah Blah
Result 3: Blah Blah
Actual)
Result 1: BlahBlahBlah BlahBlahBlah
Result 2: 
Result 3: 
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These notes will help understanding how your code works. Thanks! -->

### 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: Evan Mattson <[email protected]>

python/samples/getting_started/10-multiple-results-per-prompt.ipynb

@@ -471,9 +471,8 @@
     "        current_time = time.time()\n",
     "\n",
     "        # Update texts with new results\n",
-    "        for idx, result in enumerate(results):\n",
-    "            if idx < number_of_responses:\n",
-    "                texts[idx] += str(result)\n",
+    "        for result in results:\n",
+    "            texts[result.choice_index] += str(result)\n",
     "\n",
     "        # Clear and display output at intervals\n",
     "        if current_time - last_clear_time > clear_interval:\n",