IIon adapter, update TCF flag (#5870)

* Doc for embi media

* Update Iion adapter doc

* Update Iion adapter doc

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Co-authored-by: apykhteyev <alex@project-limelight.com>

Author: apykhteyev

dev-docs/bidders/iionads.md

@@ -8,7 +8,8 @@ pbs: true
 media_types: video, banner
 userIds: all
 fpd_supported: false
-tcfeu_supported: false
+tcfeu_supported: true
+gvl_id: 1358
 usp_supported: true
 coppa_supported: true
 schain_supported: true