[Doc] Fix typos in documentation filenames

[quzizii]

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Documentation Related

There are two typos in the English documentation filenames under docs/en/:

1. Design_LoadBlancing.md should be Design_LoadBalancing.md ("Blancing" → "Balancing")
2. Design_Trancation.md should be Design_Transaction.md ("Trancation" → "Transaction")

These typos could mislead readers and affect documentation discoverability.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[nhlamulothompson-afk]

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