Fix broken link to Clusterless Decoding tutorial notebook from Sorted Spikes Decoding tutorial notebook

[khl02007]

Description

Please include a summary of the changes and the related issue. Please also
include relevant motivation and context. Please list issues fixed or closed by
This PR.

• Fixes #000: How this PR fixes the issue
  • path/file.py: Description of the change
  • path/file.py: Description of the change
• Fixes #000: How this PR fixes the issue
  • path/file.py: Description of the change
  • path/file.py: Description of the change

Checklist:

• This PR should be accompanied by a release: (yes/no/unsure)
• If release, I have updated the CITATION.cff
• This PR makes edits to table definitions: (yes/no)
• If table edits, I have included an alter snippet for release notes.
• If this PR makes changes to position, I ran the relevant tests locally.
• I have updated the CHANGELOG.md with PR number and description.
• I have added/edited docs/notebooks to reflect the changes

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