updated the self-signed certificate generation example

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[trujillo-adam]

Thanks for updating this! I added a few grammar and style-related suggestions. Approving so you can move forward when ready.

[connorfryar]

Added a couple of single line comment.

Context:
Providing the OpenSSL commands like we are already seems like a massive extension of an olive branch for our customers.

I think it would be appropriate to potentially change the names of the cert and the key to match the start up name requirements of TFE. cert.pem/key.pem.

Check single line comments for further clarity.

[connorfryar]

LGTM