Fix comment about line number for URL in example/meta.yml

[stefmolin]

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• [N/A] License file is packaged (see here for an example).
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• [N/A] Build number is 0.
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[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I was trying to look for recipes to lint for you, but couldn't find any.
Please ping the 'conda-forge/core' team (using the @ notation in a comment) if you believe this is a bug.

[github-actions]

Hi! Thanks for your contribution to conda-forge.
When submitting a pull request, please do not change anything in the example recipe.
Please make sure that any changes are reverted before you submit it for review.
Thanks!

[stefmolin]

@conda-forge-admin, please ping team @conda-forge/core

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-webservice.

I was asked to ping @conda-forge/staged-recipes and so here I am doing that.