docs: fixed bytecode compression example

[benceharomi]

What ❔

Updated the bytecode compression explanation example, to be valid and working.

In the connecting contracts PR: matter-labs/era-contracts#193 I added a test that checks the bytecode and runs the publishCompressBytecode function with the bytecode from this example.

Why ❔

The previous example was not valid, it could confuse newcomers, because the example had different bytecode compared to what was described.

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
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