docs: Add webhook batching and update retry

[EnriqueL8]

No description provided.

[nguyer]

@EnriqueL8 It looks like there is a broken link in the docs which the linter is complaining about:

For the Links > Internal check, the following failures were found:

* At ./_site/reference/types/subscription.html:623:

  internally linking to #SubscriptionOptions; the file exists, but the hash 'SubscriptionOptions' does not

[nguyer]

Closing this PR due to inactivity. Please feel free to re-open if this work is still ongoing.