Add explanation to assist in parameterized_docker_build.sh use (#13378)

* Add explanation to assist in parameterized_docker_build.sh use

Explains that using parameterized_docker_build.sh is dependent upon running from an appropriate developer image.

* Updated to comply with Gunan comments 

- Please add line wrappin, make all lines shorter than 80 characters. [DONE]
- [parameterized_docker_build.sh] should be followed by (https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/docker/parameterized_docker_build.sh) to properly have the hyperlink [DONE]
- Please wrap tensorflow/tensorflow:latest with "`" [DONE]
- Instead of right tag, let's just type . [DONE]
- Also wrap the tensorflow/tensorflow:[right tag] inside a code block with "`" [DONE]
- Wrap the whole line inside "```" block [DONE]
- also replace "right tag" with [replaced by "right_tag" is that what you meant or you prefer "."?]
- Replace with a better explanation: "If you would like to start a jupyter notebook on your docker container, make sure to map the port 8888 of your docker container by adding -p 8888:8888 to the above command." [DONE]