fix(influxdb3): duplicate licensing and resource limits sections- Rem… (#6470)

* fix(influxdb3): duplicate licensing and resource limits sections- Remove duplicate licensing section- Resolve resource limits duplicates, merging details into the Resource limits section.

* fix(influxdb3): fix broken links and enterprise-only flags in config options

- Comment out TOC links to undocumented datafusion-runtime-* dev flags
- Wrap enterprise-only section references (#licensing, #resource-limits) in conditionals
- Fix num-datafusion-threads incorrectly marked as enterprise-only
- Move Resource Limits section heading outside enterprise wrapper

Resolves broken fragment links for both Core and Enterprise builds.

Author: jstirnaman