Update forming-calls-with-graphql.md

[pberthonneau]

Several external links at the bottom have changed.
This update avoid a redirection.

Why:

Closes [issue link]

What's being changed:

Check off the following:

• I have reviewed my changes in staging (look for the latest deployment event in your pull request's timeline, then click View deployment).
• For content changes, I have completed the self-review checklist.

Writer impact (This section is for GitHub staff members only):

• This pull request impacts the contribution experience
  • I have added the 'writer impact' label
  • I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

[janiceilene]

Thanks so much for opening a PR with this update @pberthonneau! I committed a few suggestions to link to the same header we were previously linking to. Could you update the last link to avoid the redirect, as well?

Let me know when that's done and I'll get this merged ⚡

[janiceilene]

While you're making these great changes, could you update this one to https://graphql.org/learn/queries/#fragments as well?

[pberthonneau]

Sure! I must have been tired.

[janiceilene]

This looks awesome @pberthonneau! Thanks so much for taking the time to open a PR and then update it 💖 I'll update the branch and get this merged once tests are passing 🍏

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