Refresh the existing Snapd special case documentation

[ernestl]

Page URL

https://documentation.ubuntu.com/project/SRU/reference/package-specific/#snapd

Select an option

• I found what I was looking for
• I couldn't find what I was looking for
• I found the information, but it was incorrect/incomplete/confusing
• I encountered a technical issue (e.g., broken link, image not loading)

Issue Description

See: https://code.launchpad.net/~ernestl/sru-docs/+git/sru-docs/+merge/503113

Work for Tech Board approval was moved from Launchpad to github.