Update attachments content to include transactions

[imatwawana]

Core or SDK?

Core Sentry product

Which part? Which one?

Various

Description

Some SDKs (~~Cocoa~~ Java and Python) actually do support attachments for transactions but right now all of our product docs indicate that attachments are only applicable for error events. Affects the following docs: Quota Management > Key Terms Manage Your Attachments Quota Key Terms

Suggested Solution

Update these docs to clarify when attachments are supported.

[imatwawana]

@philipphofmann - Does this capture our conversation?

[philipphofmann]

Cocoa doesn't support this yet; see https://github.com/getsentry/sentry-cocoa/issues/1606.

On Java and Python, there is an extra argument addToTransactions you can pass in when creating a transaction.