Use registered trademark symbol in first mention of Kafka in README (#2176)

Author: davetroiano

README.md

@@ -1,11 +1,8 @@
-# Confluent Python Client for Apache Kafka
+# Confluent's Python Client for Apache Kafka®
 
 [![Try Confluent Cloud - The Data Streaming Platform](https://images.ctfassets.net/8vofjvai1hpv/10bgcSfn5MzmvS4nNqr94J/af43dd2336e3f9e0c0ca4feef4398f6f/confluent-banner-v2.svg)](https://confluent.cloud/signup?utm_source=github&utm_medium=banner&utm_campaign=tm.plg.cflt-oss-repos&utm_term=confluent-kafka-python)
 
-Confluent's Python Client for Apache Kafka<sup>TM</sup>
-=======================================================
-
-**confluent-kafka-python** provides a high-level `Producer`, `Consumer` and `AdminClient` compatible with all [Apache Kafka™](http://kafka.apache.org/) brokers >= v0.8, [Confluent Cloud](https://www.confluent.io/confluent-cloud/) and [Confluent Platform](https://www.confluent.io/product/compare/).
+**confluent-kafka-python** provides a high-level `Producer`, `Consumer` and `AdminClient` compatible with all [Apache Kafka](http://kafka.apache.org/) brokers >= v0.8, [Confluent Cloud](https://www.confluent.io/confluent-cloud/) and [Confluent Platform](https://www.confluent.io/product/compare/).
 
 **Recommended for Production:** While this client works with any Kafka deployment, it's optimized for and fully supported with [Confluent Cloud](https://www.confluent.io/confluent-cloud/) (fully managed) and [Confluent Platform](https://www.confluent.io/product/compare/) (self-managed), which provide enterprise-grade security, monitoring, and support.