Correct indexing links in docs

[williambdean]

Description

Some basic correction from this documentation page:
https://pytensor.readthedocs.io/en/latest/library/tensor/basic.html#indexing

Related Issue

• Closes Broken numpy links in index section #1458
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

---

📚 Documentation preview 📚: https://pytensor--1463.org.readthedocs.build/en/1463/

[williambdean]

Closes #1458

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.03%. Comparing base (646a734) to head (ce35066).
⚠️ Report is 131 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1463      +/-   ##
==========================================
- Coverage   82.14%   82.03%   -0.11%     
==========================================
  Files         213      214       +1     
  Lines       50270    50398     +128     
  Branches     8879     8897      +18     
==========================================
+ Hits        41295    41345      +50     
- Misses       6774     6848      +74     
- Partials     2201     2205       +4     

Files with missing lines	Coverage Δ
pytensor/tensor/subtensor.py	89.98% <ø> (ø)

... and 3 files with indirect coverage changes

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[williambdean]

Here are the rendered docs

https://pytensor--1463.org.readthedocs.build/en/1463/library/tensor/basic.html#indexing

[williambdean]

Added in the feedback. Will check to see how they render. Let me know what you think