Fix typo and type for pulsar.broker_lookup.quantile in metadata.csv (#24258)

* Fix typo and type for pulsar.broker_lookup.quantile in metadata.csv

The metric was misspelled as `quantle` and typed as `count`. Summary
quantiles are submitted as gauge by the OpenMetrics transformer.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Add changelog entry for pulsar metadata.csv fix

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Clarify pulsar.broker_lookup.quantile description in metadata.csv

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Remove unnecessary changelog entry

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: martavicentenavarro

pulsar/metadata.csv

@@ -30,7 +30,7 @@ pulsar.brk_ml_cursor_writeLedgerLogicalSize,gauge,,,,The size of write to ledger
 pulsar.brk_ml_cursor_writeLedgerSize,gauge,,,,The size of write to ledger.,0,pulsar,,
 pulsar.broker_load_manager_bundle_assignment,gauge,,,,The summary of latency of bundles ownership operations.,0,pulsar,,
 pulsar.broker_lookup.count,count,,,,Number of samples of the latency of all lookup operations.,0,pulsar,,
-pulsar.broker_lookup.quantle,count,,,,Latency of all lookup operations.,0,pulsar,,
+pulsar.broker_lookup.quantile,gauge,,,,Latency of all lookup operations by `quantile`.,0,pulsar,,
 pulsar.broker_lookup.sum,count,,,,Total latency of all lookup operations.,0,pulsar,,
 pulsar.broker_lookup_answers.count,count,,response,,The number of lookup responses (i.e. not redirected requests).,0,pulsar,,
 pulsar.broker_lookup_failures.count,count,,,,The number of lookup failures.,0,pulsar,,