docs: getTransactionCount

[marthendalnunes]

Adds missing "optional" flag to blockNumber and blockTag parameters in getTransactionCount docs, and remove the broken embed example.

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PR-Codex overview

This PR updates the documentation for the getTransactionCount method to clarify that both blockNumber and blockTag parameters are optional. It also removes an example section that was previously included.

Detailed summary

• Updated blockNumber to indicate it is optional.
• Updated blockTag to indicate it is optional.
• Removed the note stating that the transaction count can be used as a nonce.
• Removed the example section with an iframe.

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