docs: Update a part of docs for 2.0 (#245)

- **Remove mention of Actor.main**
- **Update example**
- **Update example**

Author: janbuchar

docs/03-concepts/01-actor-lifecycle.mdx

@@ -57,23 +57,6 @@ async def main():
         raise RuntimeError('Ouch!')
 ```
 
-#### Main function
-
-Another option is to pass a function to the Actor via the [`Actor.main(main_func)`](../../reference/class/Actor#main) method,
-which causes the Actor to initialize, run the main function, and exit, catching any runtime errors in the passed function.
-
-```python title="src/main.py"
-from apify import Actor
-
-async def actor_main_func():
-    Actor.log.info('Actor input:', await Actor.get_input())
-    await Actor.set_value('OUTPUT', 'Hello, world!')
-    raise RuntimeError('Ouch!')
-
-async def main():
-    await Actor.main(actor_main_func)
-```
-
 ### Rebooting an Actor
 
 Sometimes, you want to restart your Actor to make it run from the beginning again.

docs/03-concepts/04-actor-events.mdx

@@ -75,8 +75,7 @@ and to remove them, you use the [`Actor.off()`](../../reference/class/Actor#off)
 
 ```python title="src/main.py"
 import asyncio
-from apify import Actor
-from apify_shared.consts import ActorEventTypes
+from apify import Actor, Event
 
 async def main():
     async with Actor:
@@ -94,7 +93,7 @@ async def main():
             Actor.log.info('Saving Actor state', extra=event_data)
             await Actor.set_value('STATE', processed_items)
 
-        Actor.on(ActorEventTypes.PERSIST_STATE, save_state)
+        Actor.on(Event.PERSIST_STATE, save_state)
 
         # Do some fake work
         for i in range(processed_items, total_items):
@@ -103,7 +102,7 @@ async def main():
             await asyncio.sleep(0.1)
 
         # Suppose we can stop saving the state now
-        Actor.off(ActorEventTypes.PERSIST_STATE, save_state)
+        Actor.off(Event.PERSIST_STATE, save_state)
 
         # Do some more fake work, this time something that can't be restarted,
         # so no point persisting the state

docs/03-concepts/11-configuration.mdx

@@ -21,19 +21,19 @@ or the list of environment variables that the Actor understands.
 This will cause the Actor to persist its state every 10 seconds:
 
 ```python title="src/main.py"
-from apify import Actor
-from apify_shared.consts import ActorEventTypes
+from datetime import timedelta
+from apify import Actor, Event, Configuration
 
 async def main():
     global_config = Configuration.get_global_configuration()
-    global_config.persist_state_interval_millis = 10000
+    global_config.persist_state_interval = timedelta(seconds=10)
 
     async with Actor:
         async def save_state():
             await Actor.set_value('STATE', 'Hello, world!')
 
         # The `save_state` handler will be called every 10 seconds now
-        Actor.on(ActorEventTypes.PERSIST_STATE, save_state)
+        Actor.on(Event.PERSIST_STATE, save_state)
 ```
 
 ### Configuring via environment variables