.Net & Python: Fix Broken Links (#5393)

### Description

I used [link-inspector](https://github.com/justindhillon/link-inspector)
to find and fix broken links in this project. This is an updated PR of
#4910, which fixes the merge conflict. Here are the links I have fixed:

https://docs.microsoft.com/rest/api/keyvault/getsecrets/getsecrets -->
https://learn.microsoft.com/en-us/rest/api/keyvault/secrets/get-secret/get-secret

https://docs.microsoft.com/rest/api/keyvault/getkeys/getkeys -->
https://learn.microsoft.com/en-us/rest/api/keyvault/keys/get-keys/get-keys

https://docs.microsoft.com/rest/api/keyvault/encrypt/encrypt -->
https://learn.microsoft.com/en-us/rest/api/keyvault/keys/encrypt/encrypt

https://docs.microsoft.com/rest/api/keyvault/decrypt/decrypt -->
https://learn.microsoft.com/en-us/rest/api/keyvault/keys/decrypt/decrypt

https://docs.microsoft.com/rest/api/keyvault/createkey/createkey -->
https://learn.microsoft.com/en-us/rest/api/keyvault/keys/create-key/create-key


https://docs.microsoft.com/rest/api/keyvault/getsecretversions/getsecretversions
-->
https://learn.microsoft.com/en-us/rest/api/keyvault/secrets/get-secret-versions/get-secret-versions


https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planning/plan.py
-->
https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planners/plan.py


https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planning/sequential_planner/Plugins/SequentialPlanning/skprompt.txt
-->
https://github.com/microsoft/semantic-kernel/blob/main/samples/plugins/QAPlugin/Form/skprompt.txt



### Support my work

These links were found with
[link-inspector](https://github.com/justindhillon/link-inspector). If
you find this PR useful, give the repo a ⭐

### Contribution Checklist

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

- [X] The code builds clean without any errors or warnings
- [X] 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
- [X] All unit tests pass, and I have added new tests where possible
- [X] I didn't break anyone 😄

---------

Co-authored-by: Stuart Morris <[email protected]>
Co-authored-by: SergeyMenshykh <[email protected]>
Co-authored-by: Mark Wallace <[email protected]>
Co-authored-by: Roger Barreto <[email protected]>
Co-authored-by: Jadyn <[email protected]>
Co-authored-by: Evan Mattson <[email protected]>
Co-authored-by: Chris <[email protected]>
Co-authored-by: Eduard van Valkenburg <[email protected]>

python/notebooks/05-using-the-planner.ipynb

@@ -341,7 +341,7 @@
    "source": [
     "To build more advanced planners, we need to introduce a proper Plan object that can contain all the necessary state and information needed for high quality plans.\n",
     "\n",
-    "To see what that object model is, look at (https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planning/plan.py)\n"
+    "To see what that object model is, look at (https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planners/plan.py)\n"
    ]
   },
   {
@@ -357,7 +357,7 @@
    "id": "a1c66d83",
    "metadata": {},
    "source": [
-    "The sequential planner is an XML-based step-by-step planner. You can see the prompt used for it here (https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planners/sequential_planner/Plugins/SequentialPlanning/skprompt.txt))\n"
+    "The sequential planner is an XML-based step-by-step planner. You can see the prompt used for it here (https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/planners/sequential_planner/Plugins/SequentialPlanning/skprompt.txt)\n"
    ]
   },
   {