Docs: Update s3 repository docs with client settings (#26033)
Docs: Update s3 repository docs with client settings (#26033)

This commit updates the s3 repository docs to clearly mark settings as
part of the s3 client settings, as well as those that are secure and
must be stored in the elasticsearch keystore.

relates #25619

masaruh/elasticsearch,GlenRSmith/elasticsearch,Stacey-Gammon/elasticsearch,wenpos/elasticsearch,qwerty4030/elasticsearch,pozhidaevak/elasticsearch,robin13/elasticsearch,gfyoung/elasticsearch,kalimatas/elasticsearch,masaruh/elasticsearch,maddin2016/elasticsearch,gingerwizard/elasticsearch,uschindler/elasticsearch,brandonkearby/elasticsearch,s1monw/elasticsearch,s1monw/elasticsearch,wenpos/elasticsearch,pozhidaevak/elasticsearch,maddin2016/elasticsearch,rajanm/elasticsearch,wangtuo/elasticsearch,HonzaKral/elasticsearch,uschindler/elasticsearch,HonzaKral/elasticsearch,lks21c/elasticsearch,fred84/elasticsearch,markwalkom/elasticsearch,GlenRSmith/elasticsearch,ThiagoGarciaAlves/elasticsearch,fred84/elasticsearch,scorpionvicky/elasticsearch,nknize/elasticsearch,GlenRSmith/elasticsearch,markwalkom/elasticsearch,wenpos/elasticsearch,maddin2016/elasticsearch,wangtuo/elasticsearch,umeshdangat/elasticsearch,qwerty4030/elasticsearch,fred84/elasticsearch,mjason3/elasticsearch,kalimatas/elasticsearch,mjason3/elasticsearch,umeshdangat/elasticsearch,Stacey-Gammon/elasticsearch,mohit/elasticsearch,scottsom/elasticsearch,scorpionvicky/elasticsearch,nknize/elasticsearch,masaruh/elasticsearch,coding0011/elasticsearch,wangtuo/elasticsearch,mjason3/elasticsearch,mohit/elasticsearch,rajanm/elasticsearch,wangtuo/elasticsearch,masaruh/elasticsearch,robin13/elasticsearch,kalimatas/elasticsearch,coding0011/elasticsearch,lks21c/elasticsearch,s1monw/elasticsearch,wenpos/elasticsearch,markwalkom/elasticsearch,mjason3/elasticsearch,Stacey-Gammon/elasticsearch,lks21c/elasticsearch,scottsom/elasticsearch,scorpionvicky/elasticsearch,brandonkearby/elasticsearch,rajanm/elasticsearch,rajanm/elasticsearch,scorpionvicky/elasticsearch,uschindler/elasticsearch,gingerwizard/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,scottsom/elasticsearch,uschindler/elasticsearch,uschindler/elasticsearch,lks21c/elasticsearch,scorpionvicky/elasticsearch,mohit/elasticsearch,kalimatas/elasticsearch,markwalkom/elasticsearch,robin13/elasticsearch,coding0011/elasticsearch,Stacey-Gammon/elasticsearch,robin13/elasticsearch,wenpos/elasticsearch,gingerwizard/elasticsearch,mjason3/elasticsearch,markwalkom/elasticsearch,ThiagoGarciaAlves/elasticsearch,wangtuo/elasticsearch,brandonkearby/elasticsearch,s1monw/elasticsearch,ThiagoGarciaAlves/elasticsearch,qwerty4030/elasticsearch,markwalkom/elasticsearch,nknize/elasticsearch,brandonkearby/elasticsearch,gingerwizard/elasticsearch,ThiagoGarciaAlves/elasticsearch,gfyoung/elasticsearch,gfyoung/elasticsearch,scottsom/elasticsearch,umeshdangat/elasticsearch,gingerwizard/elasticsearch,pozhidaevak/elasticsearch,nknize/elasticsearch,gfyoung/elasticsearch,kalimatas/elasticsearch,s1monw/elasticsearch,robin13/elasticsearch,fred84/elasticsearch,ThiagoGarciaAlves/elasticsearch,umeshdangat/elasticsearch,Stacey-Gammon/elasticsearch,qwerty4030/elasticsearch,gingerwizard/elasticsearch,scottsom/elasticsearch,gingerwizard/elasticsearch,ThiagoGarciaAlves/elasticsearch,umeshdangat/elasticsearch,fred84/elasticsearch,rajanm/elasticsearch,masaruh/elasticsearch,HonzaKral/elasticsearch,maddin2016/elasticsearch,pozhidaevak/elasticsearch,pozhidaevak/elasticsearch,qwerty4030/elasticsearch,mohit/elasticsearch,rajanm/elasticsearch,brandonkearby/elasticsearch,gfyoung/elasticsearch,HonzaKral/elasticsearch,maddin2016/elasticsearch,mohit/elasticsearch,nknize/elasticsearch,lks21c/elasticsearch,coding0011/elasticsearch,coding0011/elasticsearch