auto merge of #18176 : jkleint/rust/guide-borrow-wording, r=steveklabnik
auto merge of #18176 : jkleint/rust/guide-borrow-wording, r=steveklabnik

Explain the primary disadvantage of garbage collection is runtime
overhead and unpredictable pauses.  Elucidate where the name "race
condition" comes from.  Emphasize that Rust can guarantee your code is
free of race conditions and other memory errors, with no runtime
overhead.

cc @steveklabnik 

quornian/rust,philyoon/rust,graydon/rust,vhbit/rust,victorvde/rust,jroesch/rust,pelmers/rust,carols10cents/rust,l0kod/rust,robertg/rust,seanrivera/rust,bombless/rust,miniupnp/rust,sae-bom/rust,mvdnes/rust,ebfull/rust,jroesch/rust,richo/rust,0x73/rust,carols10cents/rust,andars/rust,rprichard/rust,zaeleus/rust,vhbit/rust,untitaker/rust,l0kod/rust,mvdnes/rust,XMPPwocky/rust,ktossell/rust,AerialX/rust-rt-minimal,XMPPwocky/rust,zaeleus/rust,jashank/rust,kimroen/rust,miniupnp/rust,jashank/rust,rohitjoshi/rust,0x73/rust,zachwick/rust,krzysz00/rust,barosl/rust,hauleth/rust,nwin/rust,kwantam/rust,mahkoh/rust,aepsil0n/rust,dinfuehr/rust,robertg/rust,mdinger/rust,bombless/rust-docs-chinese,zachwick/rust,mihneadb/rust,mahkoh/rust,zachwick/rust,l0kod/rust,defuz/rust,sae-bom/rust,dwillmer/rust,carols10cents/rust,pelmers/rust,mvdnes/rust,GBGamer/rust,l0kod/rust,aneeshusa/rust,seanrivera/rust,seanrivera/rust,ktossell/rust,defuz/rust,untitaker/rust,KokaKiwi/rust,bombless/rust,victorvde/rust,GBGamer/rust,victorvde/rust,pelmers/rust,reem/rust,jroesch/rust,untitaker/rust,nwin/rust,mdinger/rust,AerialX/rust,quornian/rust,mdinger/rust,TheNeikos/rust,ktossell/rust,TheNeikos/rust,omasanori/rust,zubron/rust,jroesch/rust,dwillmer/rust,nwin/rust,rohitjoshi/rust,graydon/rust,jroesch/rust,aepsil0n/rust,emk/rust,richo/rust,GBGamer/rust,rprichard/rust,emk/rust,kwantam/rust,pshc/rust,dinfuehr/rust,jroesch/rust,hauleth/rust,untitaker/rust,aneeshusa/rust,omasanori/rust,aidancully/rust,gifnksm/rust,aidancully/rust,KokaKiwi/rust,aepsil0n/rust,ktossell/rust,aidancully/rust,aneeshusa/rust,quornian/rust,philyoon/rust,avdi/rust,hauleth/rust,defuz/rust,quornian/rust,emk/rust,vhbit/rust,kwantam/rust,reem/rust,defuz/rust,seanrivera/rust,TheNeikos/rust,jashank/rust,mahkoh/rust,richo/rust,miniupnp/rust,jashank/rust,andars/rust,dwillmer/rust,omasanori/rust,0x73/rust,kimroen/rust,dwillmer/rust,pshc/rust,rprichard/rust,rprichard/rust,sae-bom/rust,carols10cents/rust,ruud-v-a/rust,ktossell/rust,aepsil0n/rust,gifnksm/rust,miniupnp/rust,dinfuehr/rust,KokaKiwi/rust,mvdnes/rust,carols10cents/rust,nwin/rust,AerialX/rust-rt-minimal,barosl/rust,emk/rust,aepsil0n/rust,nwin/rust,rohitjoshi/rust,dwillmer/rust,0x73/rust,seanrivera/rust,dinfuehr/rust,avdi/rust,hauleth/rust,ktossell/rust,zubron/rust,ejjeong/rust,ruud-v-a/rust,andars/rust,AerialX/rust-rt-minimal,miniupnp/rust,avdi/rust,ejjeong/rust,TheNeikos/rust,mahkoh/rust,KokaKiwi/rust,ebfull/rust,ejjeong/rust,bombless/rust,kimroen/rust,aidancully/rust,barosl/rust,jashank/rust,mihneadb/rust,emk/rust,XMPPwocky/rust,victorvde/rust,nwin/rust,gifnksm/rust,ktossell/rust,philyoon/rust,vhbit/rust,ebfull/rust,GBGamer/rust,pshc/rust,pshc/rust,philyoon/rust,barosl/rust,gifnksm/rust,cllns/rust,kimroen/rust,krzysz00/rust,pelmers/rust,victorvde/rust,jroesch/rust,zubron/rust,barosl/rust,hauleth/rust,omasanori/rust,reem/rust,zaeleus/rust,XMPPwocky/rust,gifnksm/rust,AerialX/rust-rt-minimal,avdi/rust,aidancully/rust,cllns/rust,jroesch/rust,cllns/rust,ebfull/rust,richo/rust,ejjeong/rust,robertg/rust,kwantam/rust,zaeleus/rust,kimroen/rust,TheNeikos/rust,GBGamer/rust,mvdnes/rust,dwillmer/rust,carols10cents/rust,KokaKiwi/rust,kwantam/rust,miniupnp/rust,mihneadb/rust,AerialX/rust-rt-minimal,dwillmer/rust,rohitjoshi/rust,zachwick/rust,AerialX/rust-rt-minimal,krzysz00/rust,richo/rust,zubron/rust,zaeleus/rust,cllns/rust,jashank/rust,mihneadb/rust,kimroen/rust,ruud-v-a/rust,TheNeikos/rust,emk/rust,bombless/rust,mahkoh/rust,vhbit/rust,krzysz00/rust,XMPPwocky/rust,bombless/rust,untitaker/rust,defuz/rust,ruud-v-a/rust,aneeshusa/rust,graydon/rust,reem/rust,vhbit/rust,avdi/rust,vhbit/rust,AerialX/rust,robertg/rust,andars/rust,philyoon/rust,zachwick/rust,ruud-v-a/rust,AerialX/rust,omasanori/rust,philyoon/rust,zubron/rust,quornian/rust,mvdnes/rust,nwin/rust,robertg/rust,rohitjoshi/rust,AerialX/rust,ruud-v-a/rust,kwantam/rust,richo/rust,miniupnp/rust,0x73/rust,sae-bom/rust,mdinger/rust,aneeshusa/rust,robertg/rust,victorvde/rust,pelmers/rust,l0kod/rust,dinfuehr/rust,avdi/rust,jashank/rust,barosl/rust,pshc/rust,barosl/rust,0x73/rust,pelmers/rust,mihneadb/rust,GBGamer/rust,ejjeong/rust,defuz/rust,omasanori/rust,l0kod/rust,sae-bom/rust,ejjeong/rust,mdinger/rust,gifnksm/rust,sae-bom/rust,reem/rust,rprichard/rust,0x73/rust,quornian/rust,mdinger/rust,aneeshusa/rust,seanrivera/rust,rprichard/rust,aepsil0n/rust,miniupnp/rust,pshc/rust,dinfuehr/rust,andars/rust,pshc/rust,aidancully/rust,GBGamer/rust,untitaker/rust,krzysz00/rust,graydon/rust,zaeleus/rust,mahkoh/rust,zubron/rust,kimroen/rust,reem/rust,cllns/rust,graydon/rust,KokaKiwi/rust,pshc/rust,andars/rust,nwin/rust,graydon/rust,krzysz00/rust,jashank/rust,ebfull/rust,GBGamer/rust,cllns/rust,vhbit/rust,l0kod/rust,quornian/rust,rohitjoshi/rust,zachwick/rust,bombless/rust,zubron/rust,AerialX/rust,ebfull/rust,hauleth/rust,l0kod/rust,zubron/rust,dwillmer/rust,AerialX/rust,emk/rust,XMPPwocky/rust,mihneadb/rust