fix: update docs default limit value to 0 in Local API example

[Susmita-Dey]

What?

An implicit default limit of 10 documents returned when using the Payload Local API as mentioned in the document as I have set the limit:0 to disable it.

Why?

Because all of the time it's not necessary to fix the limit to 10 as default, there can be cases to disable it.

How?

const result = await payload.find({
  collection: 'posts', // required
  depth: 2,
  page: 1,
  limit: 0, // default to 0 to disable limit, to enable increase the limit
})

Fixes #12140

[ryami333]

I don't think this really addresses my issue satisfactorily. I think there needs to be a new row in this table to describe the limit option altogether: https://payloadcms.com/docs/local-api/overview#local-options-available.