Auto merge of #26313 - steveklabnik:fix_str_docs, r=alexcrichton
Auto merge of #26313 - steveklabnik:fix_str_docs, r=alexcrichton

Because these structures are created by a macro, the doc comments
don't quite work: the leading /// isn't stripped. Instead, just
use #[doc] so that they render correctly.

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