Update JF_URL docs (#382)

Author: EyalDelarea

github-action-examples/oidc-github-actions-example/.github/workflows/workflow.yml

@@ -16,7 +16,7 @@ jobs:
         uses: jfrog/setup-jfrog-cli@v4
         env:
           # JFrog platform url (for example: https://acme.jfrog.io)
-          JF_URL: ${{ secrets.JF_URL }}
+          JF_URL: ${{ vars.JF_URL }}
         with:
           # Name of the OIDC provider as specified on the OIDC integration page in the JFrog Platform
           oidc-provider-name: setup-jfrog-cli

github-action-examples/simple-github-action-example/.github/workflows/workflow.yml

@@ -11,7 +11,7 @@ jobs:
         uses: jfrog/setup-jfrog-cli@v4
         env:
           # JFrog platform url (for example: https://acme.jfrog.io)
-          JF_URL: ${{ secrets.JF_URL }}
+          JF_URL: ${{ vars.JF_URL }}
 
           # JFrog Platform access token
           JF_ACCESS_TOKEN: ${{ secrets.JF_ACCESS_TOKEN }}