chore(replay): Update README.md sample rate default values

[lucas-zimerman]

#6878 altered on version 7.33.0 the default to 0 but the docs still point as if the default was 1.0

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#skip-changelog

[Lms24]

Good catch, thanks! Let's just make sure they're both updated.

[Lms24]

Thanks!

[Lms24]

Ooops I missed the target branch 🙈 synced master->develop so everything is up to date.

@lucas-zimerman just FYI, we recently changed our branching model to gitflow. Next time, please open PRs against develop instead of master. And it's totally my fault that this went into master now, no worries :)

(although, considering that we GA replay today, it's probably good that this is on master anyway, so let's just call it a happy accident 😅 )