Landsat tutorial: fix broken link

[adamjstewart]

Description:

Fixes a broken link in https://pystac.readthedocs.io/en/latest/tutorials/creating-a-landsat-stac.html#Adding-assets

PR Checklist:

• Pre-commit hooks and tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[jsignell]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.17%. Comparing base (f15e3f6) to head (ef10918).
Report is 37 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1488   +/-   ##
=======================================
  Coverage   91.17%   91.17%           
=======================================
  Files          52       52           
  Lines        7253     7253           
  Branches      877      877           
=======================================
  Hits         6613     6613           
  Misses        460      460           
  Partials      180      180           

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