docs: fix malformed table in Extended examples index

[EDCarman]

Description

Fix an issue with a malformed table that's causing the documentation build to fail.

Issue linked

N/A

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

Summary by Sourcery

Documentation:

• Correct table formatting in doc/source/examples/extended_examples/index.rst to resolve build failure

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[sourcery-ai]

Reviewer's Guide

This PR resolves a documentation build error by correcting the reStructuredText table syntax in the Extended Examples index, ensuring proper header separators and column alignment.

File-Level Changes

Change	Details	Files
Fixed reST table formatting that caused the docs build to fail	Added missing delimiter row under the table headers Ensured consistent column separators (	) throughout the table Removed extraneous whitespace from table cells

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[EDCarman]

@germa89 , it looks like the doc build for #4011 is still failing - this time it's my fault with a table that got broken during the corrections. This should fix it.

[sourcery-ai]

Hey @EDCarman - I've reviewed your changes and they look great!

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[EDCarman]

@germa89 I see you beat me to it with #4016. Closing this one

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.11%. Comparing base (a6e939a) to head (fd5fde1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4017      +/-   ##
==========================================
- Coverage   89.12%   89.11%   -0.01%     
==========================================
  Files         187      187              
  Lines       14970    14970              
==========================================
- Hits        13342    13341       -1     
- Misses       1628     1629       +1     

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