Update Durable Object docs to say that migrations can be inherited in wrangler.toml

[petebacondarwin]

Existing documentation URL(s)

https://developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/#durable-object-migrations-in-wranglertoml https://developers.cloudflare.com/workers/wrangler/configuration/#inheritable-keys

What changes are you suggesting?

We should add the migrations field for Durable Objects to the inheritable fields section of https://developers.cloudflare.com/workers/wrangler/configuration/#inheritable-keys

We should call out in https://developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/#durable-object-migrations-in-wranglertoml that migrations can be overridden in environments.

Additional information

No response