Fix Incorrect URL Formatting in Documentation

[savvar9991]

Correcting an incorrect URL format in the documentation.
Before:
(https://github.com/Consensys/linea-monorepo/blob/main/https://wiki.hyperledger.org/display/BESU/Coding+Conventions)
After:
Coding Conventions
Explanation:

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[savvar9991]

Hi @fab-10
I found an issue with the URL. Could you please review it when you get a chance? Thank you!