MINOR: update comments in config/producer.properties
Author: Manikumar Reddy
Reviewers: Ismael Juma
Closes from omkreddy/prodcuer.config
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
-# see org.apache.kafka.clients.producer for more details
+# see org.apache.kafka.clients.producer.ProducerConfig for more details
############################# Producer Basics #############################
