Other man pages should refer to freeciv-ruledit page in "See Also"
freeciv-client man page lists freeciv-server and freeciv-modpack in "See Also". It should list also "freeciv-ruledit" in latest branches (not in S2_6 where ruledit does almost nothing, and probably not in S3_0). Check also other man pages for their "See Also" lists.
The patch for #42138 Add man page "freeciv" contains a new man page freeciv(6), which does mention freeciv-ruledit(6) in its See Also section. That might be sufficient, there might not be a need to cross reference every man page to every other man page.