Use dash in input parameter naming in workflow syntax example

Existing actions customarily use dash rather than underscore in action
names and their inputs. The example should do the same to support
consistent style.

Author: kohtala

content/actions/reference/workflows-and-actions/workflow-syntax.md

@@ -815,18 +815,18 @@ Input parameters defined for a Docker container must use `args`. For more inform
 
 ### Example of `jobs.<job_id>.steps[*].with`
 
-Defines the three input parameters (`first_name`, `middle_name`, and `last_name`) defined by the `hello_world` action. These input variables will be accessible to the `hello-world` action as `INPUT_FIRST_NAME`, `INPUT_MIDDLE_NAME`, and `INPUT_LAST_NAME` environment variables.
+Defines the three input parameters (`first-name`, `middle-name`, and `last-name`) defined by the `hello-world` action. These input variables will be accessible to the `hello-world` action as `INPUT_FIRST-NAME`, `INPUT_MIDDLE-NAME`, and `INPUT_LAST-NAME` environment variables.
 
 ```yaml
 jobs:
   my_first_job:
     steps:
       - name: My first step
-        uses: actions/hello_world@main
+        uses: actions/hello-world@main
         with:
-          first_name: Mona
-          middle_name: The
-          last_name: Octocat
+          first-name: Mona
+          middle-name: The
+          last-name: Octocat
 ```
 
 ## `jobs.<job_id>.steps[*].with.args`