* fix(influxdb3): document exec-mem-pool-bytes usage for data persistence
Updates documentation to reflect that exec-mem-pool-bytes is used for both
query processing and parquet persistence operations, not just queries.
Based on source code analysis showing the memory pool is used by:
- Query executor for processing queries
- Persister for converting WAL data to Parquet format
Changes:
- Updated config description to include "data operations"
- Added memory usage info to durability docs for Parquet storage
- Added troubleshooting section for memory-related write performance
- Fixed capitalization of "object store" throughout
Addresses DAR #499
Source analysis: influxdb3/src/commands/serve.rs:772-798
Shows separate executors for queries and write path operations,
both using memory pools for data processing.
* fix(influxdb3): broken links to no-sync
1. Maintains the higher-level structure
2. Uses the bulleted list format for clarity
3. Adds the detailed explanations from the original Data flow section as Details items
4. Uses sentence case for all headings
5. Numbers the sections to match the original flow diagram