[Doc] Change in the number of ledger deletions metric for the bookie

[g0715158]

Search before asking

• I searched in the issues and found nothing similar.

What issue do you find in Pulsar docs?

The bookie_DELETED_LEDGER_COUNT metric is no longer available in version 3.0.x

What is your suggestion?

Replace with the bookie_DELETED_LEDGER_TOTAL metric

Any reference?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!