auto merge of #18748 : carols10cents/rust/prepend-to-append, r=alexcrichton
auto merge of #18748 : carols10cents/rust/prepend-to-append, r=alexcrichton

A most trivial documentation correction. The examples in the intro are all about adding to the end of the array, not the beginning, but this one line says "prepend".

This isn't a very serious problem, it just made me a bit confused when I got to it.

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