[Schema Inaccuracy] Create Release and Get Release by tag name parameter inconsistency

[oscard0m]

Schema Inaccuracy

Create Release uses the keyword tag_name to refer to The name of the tag
Get a release by tag name uses the keyword tag to refer to The name of the tag

Expected

Both use the same naming convetion for tag

Reproduction Steps

https://github.com/octokit/rest.js/issues/1918

[gr2m]

Both use the same naming convetion for tag

Or tag_name. tag is currently a URL parameter, it would be easier to change, as no code changes would be required, only a schema change.