Rollup merge of #26828 - steveklabnik:gh25765, r=bluss
Rollup merge of #26828 - steveklabnik:gh25765, r=bluss

Each formatting trait now has an example of implementation, as well as a
fuller description of what it's supposed to output.

It also contains a link to the module-level documentation which

Fixes #25765

mvdnes/rust,aidancully/rust,dwillmer/rust,aidancully/rust,jashank/rust,reem/rust,aidancully/rust,zubron/rust,graydon/rust,jroesch/rust,l0kod/rust,pshc/rust,graydon/rust,graydon/rust,pshc/rust,nwin/rust,jashank/rust,pshc/rust,dwillmer/rust,jroesch/rust,nwin/rust,mvdnes/rust,GBGamer/rust,pshc/rust,mvdnes/rust,l0kod/rust,nwin/rust,vhbit/rust,jroesch/rust,nwin/rust,dwillmer/rust,zubron/rust,l0kod/rust,l0kod/rust,GBGamer/rust,jashank/rust,GBGamer/rust,jroesch/rust,dwillmer/rust,jashank/rust,vhbit/rust,GBGamer/rust,GBGamer/rust,dwillmer/rust,zubron/rust,jroesch/rust,dwillmer/rust,jashank/rust,jroesch/rust,mvdnes/rust,aidancully/rust,l0kod/rust,pshc/rust,nwin/rust,zubron/rust,pshc/rust,vhbit/rust,zubron/rust,nwin/rust,nwin/rust,jroesch/rust,GBGamer/rust,graydon/rust,l0kod/rust,vhbit/rust,zubron/rust,GBGamer/rust,vhbit/rust,jashank/rust,zubron/rust,nwin/rust,pshc/rust,mvdnes/rust,jashank/rust,reem/rust,vhbit/rust,mvdnes/rust,dwillmer/rust,reem/rust,dwillmer/rust,aidancully/rust,reem/rust,jroesch/rust,jashank/rust,l0kod/rust,l0kod/rust,pshc/rust,GBGamer/rust,vhbit/rust,vhbit/rust,zubron/rust,graydon/rust,aidancully/rust,graydon/rust,reem/rust,reem/rust