Fix doc formatting issues (open-telemetry#3062)

Co-authored-by: Emídio Neto <[email protected]>

Author: buger

instrumentation/opentelemetry-instrumentation-aiokafka/src/opentelemetry/instrumentation/aiokafka/__init__.py

@@ -18,7 +18,7 @@
 Usage
 -----
 
-..code:: python
+.. code:: python
 
     from opentelemetry.instrumentation.aiokafka import AIOKafkaInstrumentor
     from aiokafka import AIOKafkaProducer, AIOKafkaConsumer
@@ -45,7 +45,8 @@ def async_produce_hook(span: Span, args, kwargs)
 def async_consume_hook(span: Span, record: kafka.record.ABCRecord, args, kwargs)
 for example:
 
-.. code: python
+.. code:: python
+
     from opentelemetry.instrumentation.kafka import AIOKafkaInstrumentor
     from aiokafka import AIOKafkaProducer, AIOKafkaConsumer
 

instrumentation/opentelemetry-instrumentation-confluent-kafka/src/opentelemetry/instrumentation/confluent_kafka/__init__.py

@@ -18,7 +18,7 @@
 Usage
 -----
 
-.. code-block:: python
+.. code:: python
 
     from opentelemetry.instrumentation.confluent_kafka import ConfluentKafkaInstrumentor
     from confluent_kafka import Producer, Consumer
@@ -54,7 +54,6 @@ def basic_consume_loop(consumer, topics):
             consumer.close()
 
     basic_consume_loop(consumer, "my-topic")
-    ---
 
 The _instrument method accepts the following keyword args:
   tracer_provider (TracerProvider) - an optional tracer provider
@@ -95,7 +94,6 @@ def instrument_consumer(consumer: Consumer, tracer_provider=None)
     p.produce('my-topic',b'raw_bytes')
     msg = c.poll()
 
-___
 """
 
 from typing import Collection

instrumentation/opentelemetry-instrumentation-kafka-python/src/opentelemetry/instrumentation/kafka/__init__.py

@@ -18,7 +18,7 @@
 Usage
 -----
 
-..code:: python
+.. code:: python
 
     from opentelemetry.instrumentation.kafka import KafkaInstrumentor
     from kafka import KafkaProducer, KafkaConsumer
@@ -45,7 +45,8 @@ def produce_hook(span: Span, args, kwargs)
 def consume_hook(span: Span, record: kafka.record.ABCRecord, args, kwargs)
 for example:
 
-.. code: python
+.. code:: python
+
     from opentelemetry.instrumentation.kafka import KafkaInstrumentor
     from kafka import KafkaProducer, KafkaConsumer