Fix Minor Documentation Errors

[mdqst]

Changes made

1. book/run/config.md:

   • "which download historical headers" has been corrected to "which downloads historical headers". This correction is necessary because the context implies an ongoing action, so the verb should be in the singular present form.
   • "which download historical block bodies" has also been corrected to "which downloads historical block bodies" for consistency with the previous fix.
   • "The amount of transactions" has been corrected to "The number of transactions". This change ensures grammatical accuracy, as "amount" is typically used for uncountable nouns, while "number" should be used with countable nouns like "transactions".

2. book/run/sync-op-mainnet.md:

   • "bedrock state" has been updated to "Bedrock state" to properly capitalize the term, which refers to a specific technology or state related to OP mainnet.

3. book/run/transactions.md:

   • "EIP-4844 Transaction" has been changed to "EIP-4844 Transactions". The plural form is required here, as the documentation refers to the general category of transactions, not just a single transaction.

Importance

The changes in this PR are critical for ensuring that the documentation is clear, accurate, and professionally written. Correct grammatical usage helps prevent confusion for users and contributors who rely on the documentation for accurate information. The specific terminology changes also make sure that the technical terms and concepts are presented properly, aligning with industry standards and best practices.

Thank you for reviewing this PR!