fix(docs): clarify the default for tag_name (#544)
The logic here:
01570a1f39/src/github.ts (L217)
transforms `github.ref` in such a way that it matches `github.ref_name` instead. 
Per [docs](https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/accessing-contextual-information-about-workflow-runs#github-context):
> github.ref_name	string	The short ref name of the branch or tag that triggered the workflow run. This value matches the branch or tag name shown on GitHub. For example, feature-branch-1.
Note, I could imagine a PR that changes the TypeScript code to use that variable instead, but I'm trying to be conservative here. Perhaps some users are on-prem GitHub Enterprise and that variable doesn't exist.
			
			
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		| @@ -186,7 +186,7 @@ The following are optional as `step.with` keys | ||||
| | `preserve_order`           | Boolean | Indicator of whether order of files should be preserved when uploading assets                                                                                                                                                                                                                                                                                                                                                                   | | ||||
| | `files`                    | String  | Newline-delimited globs of paths to assets to upload for release                                                                                                                                                                                                                                                                                                                                                                                | | ||||
| | `name`                     | String  | Name of the release. defaults to tag name                                                                                                                                                                                                                                                                                                                                                                                                       | | ||||
| | `tag_name`                 | String  | Name of a tag. defaults to `github.ref`                                                                                                                                                                                                                                                                                                                                                                                                         | | ||||
| | `tag_name`                 | String  | Name of a tag. defaults to `github.ref_name`                                                                                                                                                                                                                                                                                                                                                                                                         | | ||||
| | `fail_on_unmatched_files`  | Boolean | Indicator of whether to fail if any of the `files` globs match nothing                                                                                                                                                                                                                                                                                                                                                                          | | ||||
| | `repository`               | String  | Name of a target repository in `<owner>/<repo>` format. Defaults to GITHUB_REPOSITORY env variable                                                                                                                                                                                                                                                                                                                                              | | ||||
| | `target_commitish`         | String  | Commitish value that determines where the Git tag is created from. Can be any branch or commit SHA. Defaults to repository default branch.                                                                                                                                                                                                                                                                                                      | | ||||
|   | ||||
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