[DOCS] Fix typos in documentation filenames “Design_LoadBlancing.md” & “Design_Trancation.md”

[quzizii]

Which Issue(s) This PR Fixes

• Fixes [Doc] Fix typos in documentation filenames #10503

Brief Description

Fix two typos in English documentation filenames under docs/en/:

• Design_LoadBlancing.md → Design_LoadBalancing.md
• Design_Trancation.md → Design_Transaction.md

Changelog

• Rename docs/en/Design_LoadBlancing.md to docs/en/Design_LoadBalancing.md
• Rename docs/en/Design_Trancation.md to docs/en/Design_Transaction.md

How Did You Test This Change?

• Verified the filename changes locally.
• Confirmed this PR only renames documentation files without modifying content.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.01%. Comparing base (3a56824) to head (722f6e1).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10505      +/-   ##
=============================================
- Coverage      48.13%   48.01%   -0.12%     
+ Complexity     13352    13320      -32     
=============================================
  Files           1377     1377              
  Lines         100707   100707              
  Branches       13010    13010              
=============================================
- Hits           48476    48359     -117     
- Misses         46297    46395      +98     
- Partials        5934     5953      +19     

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