Update README.md for ssl.ca.certificates

[chicagobuss]

try number 2 to strike a balance between informative/useful/concise

[ghost]

@confluentinc It looks like @chicagobuss just signed our Contributor License Agreement. :+1:

Always at your service,

clabot

[cla-assistant[bot]]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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