chore: add storage_driver_buffer_duration in Influxdb storage docs

[matcornic]

No description provided.

[k8s-ci-robot]

Hi @matcornic. Thanks for your PR.

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[matcornic]

I signed it!

[googlebot]

CLAs look good, thanks!

[dashpole]

@k8s-bot ok to test

[dashpole]

@k8s-bot test this

[dashpole]

I would prefer if you used the same description as in storage/common_flags.go, just to be consistent. This will have to rebase before it can go in.

[dashpole]

please squash, and we can get this merged!

[dashpole]

/retest