docs: actor.json docs should mention meta property

[JMatej]

Initializing an Actor from the templates creates .actor/actor.json with meta property included:

"meta": {
     "templateId": "ts-crawlee-playwright-chrome"
},

But I cannot find it in the docs reference: https://docs.apify.com/platform/actors/development/actor-definition/actor-json#reference.

The same goes for title.