fix(rabbitmq): correct pika pypi reference (testcontainers#817)

## PR Summary
This small PR fixes the pika pypi reference in RabbitMqContainer class
page.
Relevant page:
https://testcontainers-python.readthedocs.io/en/latest/modules/rabbitmq/README.html

Signed-off-by: Emmanuel Ferdman <[email protected]>

Author: emmanuel-ferdman

modules/rabbitmq/testcontainers/rabbitmq/__init__.py

@@ -10,7 +10,7 @@
 class RabbitMqContainer(DockerContainer):
     """
     Test container for RabbitMQ. The example below spins up a RabbitMQ broker and uses the
-    `pika client library <(https://pypi.org/project/pika/)>`__ to establish a connection to the
+    `pika client library <https://pypi.org/project/pika/>`__ to establish a connection to the
     broker.
 
     Example: