Update the release page to link the javadoc, spec pdf and html

[Emily-Jiang]

The release page needs to be improved. See example on the release page of MicroProfile Config

[manovotn]

What exactly do you mean? The GH releases page?

[njr-11]

@Emily-Jiang If the releases pages is what you were referring to, I just updated it here to include directs links from the description (Javadoc | PDF | HTML) like the MP Config releases page has,
https://github.com/eclipse/microprofile-context-propagation/releases/tag/1.0

If this is what was needed, then let's close the issue