The text is not from your link to the Etiquette Guidelines directly (https://wiki.openstreetmap.org/wiki/Etiquette/Etiquette_Guidelines), but from the FAQ (https://community.openstreetmap.org/faq). Right at the start, in the first chapter “Guidelines”.
By the way, you have already sent links to the FAQ yourself on multiple occasions!
- Standardise - switch from “ref:raa” to “ref:SE:raa” - #11 by Tobias_Conradi
- Standardise - switch from “ref:raa” to “ref:SE:raa” - #34 by Tobias_Conradi
- Chaos - lst:vatten_ha, VATTEN_HA, ist:vatten_ha, lst:VATTEN_HA - #5 by Tobias_Conradi
- Proposal to convert keys lst:diarienr, lst:nvrid to ref:SE:diarienr and ref:SE:nvrid - #7 by Tobias_Conradi
- Proposal to convert keys lst:diarienr, lst:nvrid to ref:SE:diarienr and ref:SE:nvrid - #14 by Tobias_Conradi
- Where in OSM to change Czech Republic to Czechia? - #7 by Tobias_Conradi
- Where in OSM to change Czech Republic to Czechia? - #11 by Tobias_Conradi
- Where in OSM to change Czech Republic to Czechia? - #16 by Tobias_Conradi
- Where in OSM to change Czech Republic to Czechia? - #17 by Tobias_Conradi
- Where in OSM to change Czech Republic to Czechia? - #34 by Tobias_Conradi
and some more…
Since you like to refer to the FAQ so often, you should actually know best what it says there. 
I’m surprised you didn’t realize yourself that the text came from there.