[DOC] Specify full form of LSS in beta series tutorial

[TamerGezici]

Makes the text more coherent (as the full form for LSA is written above) and prevents people from scrolling up to remember what LSS stands for.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d95dad9) 91.90% compared to head (6664201) 91.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4141      +/-   ##
==========================================
- Coverage   91.90%   91.82%   -0.08%     
==========================================
  Files         145      145              
  Lines       16330    16330              
  Branches     3404     3404              
==========================================
- Hits        15008    14995      -13     
- Misses        778      789      +11     
- Partials      544      546       +2     

Flag	Coverage Δ
macos-latest_3.10_test_plotting	91.68% <ø> (?)
macos-latest_3.8_test_plotting	91.64% <ø> (?)
macos-latest_3.9_test_plotting	91.65% <ø> (ø)
ubuntu-latest_3.10_test_plotting	?
ubuntu-latest_3.11_test_plotting	?
ubuntu-latest_3.12_test_plotting	?
ubuntu-latest_3.12_test_pre	?
ubuntu-latest_3.8_test_min	68.88% <ø> (ø)
ubuntu-latest_3.8_test_plot_min	?
ubuntu-latest_3.8_test_plotting	?
ubuntu-latest_3.9_test_plotting	?
windows-latest_3.10_test_plotting	?
windows-latest_3.11_test_plotting	?
windows-latest_3.12_test_plotting	91.66% <ø> (ø)
windows-latest_3.8_test_plotting	?
windows-latest_3.9_test_plotting	?

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[bthirion]

LGTM, thx.

[ymzayek]

thanks @TamerGezici this one should be good to go once the tests pass