Update the Release Script and Doc for a Patch Release

[danehans]

#291 adds initial support for release automation. The script and release doc hardcodes the patch version as 0. Update the hard-coded patch version in the script and doc to use a variable for the patch version.

Note: The best time to fix this issue is when cutting the first patch release.

[adarshagrawal38]

/assign

[danehans]

@adarshagrawal38 thanks for your willingness to help the project. However, a maintainer should be assigned to this issue during the first patch release. We have several other issues that need attention if you can help elsewhere.