mixing transaction isolation levels

[taroface]

DOC-10911

Document txn behavior when mixing Serializable and Read Committed txns.

Preview: https://deploy-preview-18929--cockroachdb-docs.netlify.app/docs/v24.2/transactions.html#mixed-isolation-levels

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Files changed:

• src/current/_includes/v23.2/sql/isolation-levels.md:
• src/current/v23.2/transactions.md
• src/current/v23.2/architecture/transaction-layer.md
• src/current/_includes/v23.2/sql/mixed-isolation-levels.md:
• src/current/_includes/v23.2/sql/isolation-levels.md:
• src/current/v23.2/transactions.md
• src/current/v23.2/architecture/transaction-layer.md
• src/current/_includes/v24.1/sql/isolation-levels.md:
• src/current/v24.1/transactions.md
• src/current/v24.1/architecture/transaction-layer.md
• src/current/_includes/v24.1/sql/mixed-isolation-levels.md:
• src/current/_includes/v24.1/sql/isolation-levels.md:
• src/current/v24.1/transactions.md
• src/current/v24.1/architecture/transaction-layer.md
• src/current/_includes/v24.2/sql/isolation-levels.md:
• src/current/v24.2/transactions.md
• src/current/v24.2/architecture/transaction-layer.md
• src/current/_includes/v24.2/sql/mixed-isolation-levels.md:
• src/current/_includes/v24.2/sql/isolation-levels.md:
• src/current/v24.2/transactions.md
• src/current/v24.2/architecture/transaction-layer.md

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[taroface]

lgtm non-blocking formatting nit for all versions to add break tags for readability

TFTR! I am going to merge as-is because I think this is a larger style issue. I think inserting break tags in the middle of sentences feels grammatically incorrect. Even though some of the lines in your screenshot are more readable, they also look wrong to me (particularly the shorter lines in the first bullet), as though something glitched on the webpage. We can discuss this offline.