Updated outdated content from bug bash in samples for Event Hubs

[AlexGhiondea]

Update from @ramya-rao-a :

Update the outdated content found in #15111

[swathipil]

Copying over bugs from issue #15111 for clarity:

BUGS +PRs :

SYNC SAMPLES

• authenticate_with_sas_token.py --> (PR: fixed typo in EH sample + readme #15954)

• authenticate_with_sas_token.py, Line 9: replace ServiceBus with EventHub

• recv_with_checkpoint_by_batch.py --> (PR: renamed checkpoint by batch samples to by event count #15977 )

• line 54: misnomer, since receive_batch() is not used. naming + description should more accurately indicate checkpoint being updated in by event count.

ASYNC_SAMPLES

• connection_string_authentication_async.py --> (PR: fixed syntax error in EH async auth sample #15955)

• line 23: results in "SyntaxError: 'async with' outside async function"

• recv_with_checkpoint_by_batch_async.py --> (PR: renamed checkpoint by batch samples to by event count #15977)

• line 61: not receiving by batch, so must rename to by event count.

MISC

• [EventHub README.me] --> (PR: fixed typo in EH sample + readme #15954)

• (https://github.com/Azure/azure-sdk-for-python/tree/master/sdk/eventhub/azure-eventhub#publish-events-to-an-event-hub-asynchronously): fix "EventHubProcuer" typo

No bugs/typos found:

Sync Samples

• client_creation.py
• client_identity_authentication.py
• connection_string_authentication.py
• proxy.py
• receive_batch_with_checkpoint.py
• recv.py
• recv_for_period.py
• recv_track_last_enqueued_event_prop.py
• recv_with_checkpoint_by_time_interval.py
• recv_with_checkpoint_store.py
• recv_with_custom_starting_position.py
• sample_code_eventhub.py
• send.py
• send_stream.py
• receive_events_using_checkpoint_store.py
• receive_events_using_checkpoint_store_storage_api_version.py

Async Samples

• authenticate_with_sas_token_async.py
• client_creation_async.py
• client_identity_authentication_async.py
• iot_hub_connection_string_receive_async.py

• was able to connect to the iothub without any exceptions, so I assumed receiving events with the EventHubConsumer would work as well. did not actually send events to the iot hub, since it would take extra time to setup, which was not the objective of the sample.

• proxy_async.py
• receive_batch_with_checkpoint_async.py
• recv_async.py
• recv_for_period_async.py
• recv_track_last_enqueued_event_prop_async.py
• recv_with_checkpoint_by_time_interval_async.py
• recv_with_checkpoint_store_async.py
• recv_with_custom_starting_position_async.py
• sample_code_eventhub_async.py
• send_async.py
• send_stream_async.py
• receive_events_using_checkpoint_store.py
• receive_events_using_checkpoint_store_storage_api_version.py

[swathipil]

Copying @yunhaoling 's comment on #15111 :

• Event Hubs Python samples under docs.microsoft.com/samples

Samples	Link	Status	Notes	Action
Azure Event Hubs client library for Python Samples	link	ALL SAMPLES TESTED	all fixed, PRs for updates linked above	none
Collecting Scheduled Events with Event Hub	link	NOT TESTED	did not test, since it does not use EH SDK. does this need to be tested?
Azure Event Hubs client library samples with persistent checkpointing for Python	link	ALL SAMPLES TESTED	samples work	none
Azure Event Hubs client library samples with persistent checkpointing for Python	link	ALL SAMPLES TESTED	samples work. this is an async sample, but same title as the sync one, can we improve that? --> Updated title #15958	none

• Event Hubs Python samples repos under Azure-samples org:
  • no sample code repo for python + eventhub (?)
  • keywords checked: eventhub(EventHub), event hub(Event Hub), event hubs(Event Hubs), event-hub(Event-Hub), event-hubs(Event-Hubs)

[swathipil]

all bugs in samples fixed, so all samples should work now