fix typo in README for default on tag_name

- also cleanup optional/required for easier reading and understanding.

Author: thadguidry

README.md

@@ -5,9 +5,9 @@ Add following step to your workflow:
 ```yaml
 - uses: dev-drprasad/[email protected]
   with:
-    delete_release: true # default: false
-    tag_name: v0.1.0 # tag name to delete
-    repo: <owner>/<repoName> # target repo (optional). defaults to repo running this action
+    tag_name: v0.1.0 #(required) tag name to delete 
+    delete_release: true #(optional) default: true 
+    repo: <owner>/<repoName> #(optional) target repository. default: repo running this action
   env:
     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```