docs(changeset): fixup changeset for growthbook package init

[Slashgear]

Why

The changeset I wrote in my PR refer to incorrect name of package before review was applied.
This make the release job fail on main branch. See here https://github.com/scaleway/scaleway-lib/actions/runs/5782763966

How

• change name of changeset file starting with pr
• change the name of the declared package to match existing one

[changeset-bot]

⚠️ No Changeset found

Latest commit: adafbc5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes changesets to release 1 package

Name	Type
@scaleway/use-growthbook	Major

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[codecov]

Codecov Report

Merging #1434 (adafbc5) into main (c726608) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1434   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
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  Files          26       26           
  Lines         688      688           
  Branches       97       97           
=======================================
  Hits          679      679           
  Misses          1        1           
  Partials        8        8