Revert improvement text deletion

[Eithea]

What this PR does / why we need it?

revert to the stable version

Any background context you want to provide?

What are the relevant tickets?

Fixes #

Checklist

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Merging #323 (b0ec008) into main (ab8bd87) will increase coverage by 0.30%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   87.44%   87.75%   +0.30%     
==========================================
  Files          70       70              
  Lines        5114     5047      -67     
  Branches      517      504      -13     
==========================================
- Hits         4472     4429      -43     
+ Misses        453      433      -20     
+ Partials      189      185       -4     

Impacted Files	Coverage Δ
src/util/splay_tree.ts	91.82% <50.00%> (+9.55%)	⬆️
src/document/crdt/rga_tree_list.ts	85.95% <100.00%> (ø)
src/document/crdt/rga_tree_split.ts	93.46% <100.00%> (-0.19%)	⬇️

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[hackerwins]

Thanks for your contribution!