Link Enterprise v1.12.3 changelog entries to documentation

[jstirnaman]

Context

PR #6950 adds Enterprise v1.12.3 release notes. Once the per-issue documentation PRs land, the changelog entries should link to the relevant docs sections — matching what was done for OSS in #7011.

Changelog entries to link

After the corresponding docs PRs merge, update content/enterprise_influxdb/v1/about-the-project/release-notes.md to link each v1.12.3 feature entry to its documentation:

Feature	Target docs PR	Link target
time_format parameter	#7011	/enterprise_influxdb/v1/tools/api/#query-data-with-a-select-statement-and-the-time_format-parameter
-timeout global flag	TBD	influxd-ctl global flags section
-e flag on show-shards	TBD	influxd-ctl show-shards options
rpc-resettable-*-timeout config	TBD	config-data-nodes cluster section
influx-meta cleanup-shards	TBD	New influx-meta page
CQ diagnostics in /debug/vars	TBD	api.md debug/vars section
Running config in /debug/vars	TBD	api.md debug/vars section
Smarter backup node selection	TBD	influxd-ctl backup section
SHOW QUERIES user column	TBD	Query language docs
SIGHUP log level reload	TBD	Config or administration docs
Per-user query bytes	TBD	api.md debug/vars section
Backup compression flags	#6950 (partial)	influxd-ctl backup options

Approach

Either stack a PR on jts-enterprise-v1.12.3-release or create a follow-up PR after #6950 merges. Update the link targets as each docs PR merges.