[viethqb]

Summary

Updates the "Shared tag service" note on the Trino on OPA page for egret-data/platform#845:

• one rebuild now takes about 50 ms;
• the last of 10 profiles sharing a tag service becomes current about 0.5 s after the change, and the last of 20 about 1 s;
• the old sentence "the time also grows with the total number of grants and rules on the installation" no longer holds, so it is replaced: a rebuild reads only the profile's own catalogs' grants and rules, plus every tag rule.

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