Update flutter.md

[julinvictus]

What does this PR do? What is the motivation?

According to doc
https://docs.datadoghq.com/real_user_monitoring/mobile_and_tv_monitoring/setup/flutter/#automatically-track-resources

correct param is traceSampleRate

Merge instructions

• Please merge after reviewing

Additional notes

[rtrieu]

Thanks for this update!

[rtrieu]

/merge

[dd-devflow]

🚂 MergeQueue: waiting for PR to be ready

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Use /merge -c to cancel this operation!

[dd-devflow]

⚠️ MergeQueue: This merge request was unqueued

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[julinvictus]

@fuzzybinary @rtrieu is there anything wrong with Synth test step? I rebased several times and didn't work (also in another PR)

[rtrieu]

Hi @julinvictus, the reason the check is not passing is because the branch name does not follow the required naming convention that creates a preview branch. The branch simply needs a / in it in order for the GitLab pipeline to run - something to keep in mind for next time :) I have copied your changes to another branch and will close this one!