Update heroku-log-forwarding.mdx

[hrai-nr]

Changing the documentation to reflect new changes

Please follow conventional commit standards
in your commit messages and pull request title.

Give us some context

• What problems does this PR solve? - This will align our documentation to our product. Earlier it was saying Click Generate URL, but there is no such button.
• Add any context that will help us review your changes such as testing notes,
  links to related docs, screenshots, etc.
• If your issue relates to an existing GitHub issue, please link to it.

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[github-actions]

Hi @hrai-nr 👋

Thanks for your pull request! Your PR is in a queue, and a writer will take a look soon. We generally publish small edits within one business day, and larger edits within three days.

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[nbaenam]

Hi @hrai-nr, could you please sign the CLA by clicking the yellow button a few messages above this one? I'll be able to merge in as soon as you do. Thanks!

[nbaenam]

Hi @hrai-nr, thank you for fixing this! I've added a minor TW edit.