[fix][monitor] Fix the incorrect metrics name

[crossoverJie]

Motivation

Fix the incorrect metrics name.

Reference links: https://github.com/apache/pulsar/issues/21766#issuecomment-1903439335 https://github.com/apache/bookkeeper/releases/tag/release-4.16.0

Modifications

bookkeeper_server_ADD_ENTRY_REQUEST->bookkeeper_server_ADD_ENTRY bookkeeper_server_READ_ENTRY_REQUEST->bookkeeper_server_READ_ENTRY

Verifying this change

• [ ] Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• [ ] Dependencies (add or upgrade a dependency)
• [ ] The public API
• [ ] The schema
• [ ] The default values of configurations
• [ ] The threading model
• [ ] The binary protocol
• [ ] The REST endpoints
• [ ] The admin CLI options
• [ ] The metrics
• [ ] Anything that affects deployment

Documentation

• [x] doc
• [ ] doc-required
• [ ] doc-not-needed
• [ ] doc-complete

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