Remove rule that is confusing
Remove rule that is confusing

The original text stated that one should only return a unique or managed pointer if you were given one in the first place. This makes it sound as if the function *should* return a unique pointer if it were given a unique pointer. The rest of the section goes on to describe why this is bad, and the example of bad code does exactly what the rule just said to do.

I reworded the original rule into a reference to the more concise rule mentioned at the bottom of the section, which helps add emphasis (a la 'it bears repeating').
GBGamer/rust,zachwick/rust,P1start/rust,jashank/rust,zaeleus/rust,victorvde/rust,Ryman/rust,jbclements/rust,0x73/rust,emk/rust,nham/rust,krzysz00/rust,mvdnes/rust,jashank/rust,vhbit/rust,0x73/rust,jashank/rust,retep998/rand,ejjeong/rust,pczarn/rust,nham/rust,zachwick/rust,sae-bom/rust,servo/rust,AerialX/rust,aturon/rust,reem/rust,aturon/rust,nham/rust,ejjeong/rust,jbclements/rust,stepancheg/rust-ide-rust,bhickey/rand,AerialX/rust,dinfuehr/rust,philyoon/rust,miniupnp/rust,nwin/rust,untitaker/rust,richo/rust,pelmers/rust,zaeleus/rust,omasanori/rust,P1start/rust,jroesch/rust,kwantam/rust,TheNeikos/rust,mihneadb/rust,bombless/rust,miniupnp/rust,victorvde/rust,barosl/rust,GBGamer/rust,philyoon/rust,mdinger/rust,cllns/rust,carols10cents/rust,bombless/rust,erickt/rust,GBGamer/rust,reem/rust,stepancheg/rust-ide-rust,barosl/rust,vhbit/rust,TheNeikos/rust,kwantam/rust,philyoon/rust,l0kod/rust,TheNeikos/rust,sae-bom/rust,barosl/rust,aneeshusa/rust,ebfull/rust,seanrivera/rust,pshc/rust,AerialX/rust,aepsil0n/rust,stepancheg/rust-ide-rust,zachwick/rust,ebfull/rust,nham/rust,untitaker/rust,avdi/rust,pshc/rust,robertg/rust,ejjeong/rust,nwin/rust,untitaker/rust,rohitjoshi/rust,ebfull/rust,jashank/rust,hauleth/rust,XMPPwocky/rust,robertg/rust,AerialX/rust,pshc/rust,andars/rust,carols10cents/rust,pczarn/rust,seanrivera/rust,ktossell/rust,jroesch/rust,dwillmer/rust,cllns/rust,defuz/rust,mahkoh/rust,sae-bom/rust,graydon/rust,jroesch/rust,pelmers/rust,zachwick/rust,ebfull/rust,mihneadb/rust,ruud-v-a/rust,kwantam/rust,servo/rust,pshc/rust,ktossell/rust,GBGamer/rust,andars/rust,jbclements/rust,KokaKiwi/rust,gifnksm/rust,dinfuehr/rust,l0kod/rust,philyoon/rust,stepancheg/rust-ide-rust,stepancheg/rust-ide-rust,pczarn/rust,emk/rust,dwillmer/rust,ktossell/rust,Ryman/rust,nwin/rust,robertg/rust,jroesch/rust,zubron/rust,richo/rust,ruud-v-a/rust,pczarn/rust,richo/rust,dwillmer/rust,rohitjoshi/rust,AerialX/rust,ebfull/rust,jbclements/rust,carols10cents/rust,l0kod/rust,dwillmer/rust,richo/rust,vhbit/rust,bombless/rust-docs-chinese,victorvde/rust,aidancully/rust,kwantam/rust,zubron/rust,servo/rust,mvdnes/rust,nwin/rust,aneeshusa/rust,GBGamer/rust,vhbit/rust,mahkoh/rust,AerialX/rust-rt-minimal,TheNeikos/rust,andars/rust,AerialX/rust-rt-minimal,ejjeong/rust,quornian/rust,KokaKiwi/rust,erickt/rust,jroesch/rust,0x73/rust,avdi/rust,defuz/rust,TheNeikos/rust,zubron/rust,sae-bom/rust,XMPPwocky/rust,richo/rust,kimroen/rust,stepancheg/rust-ide-rust,aidancully/rust,carols10cents/rust,KokaKiwi/rust,pelmers/rust,reem/rust,Ryman/rust,emk/rust,zachwick/rust,XMPPwocky/rust,sae-bom/rust,dinfuehr/rust,P1start/rust,krzysz00/rust,dwillmer/rust,kimroen/rust,l0kod/rust,XMPPwocky/rust,reem/rust,mdinger/rust,bombless/rust,carols10cents/rust,zubron/rust,shepmaster/rand,dinfuehr/rust,rohitjoshi/rust,mdinger/rust,mihneadb/rust,l0kod/rust,ktossell/rust,AerialX/rust-rt-minimal,mdinger/rust,emk/rust,hauleth/rust,zubron/rust,mvdnes/rust,seanrivera/rust,avdi/rust,ejjeong/rust,GBGamer/rust,hauleth/rust,pshc/rust,KokaKiwi/rust,omasanori/rust,omasanori/rust,mahkoh/rust,nwin/rust,barosl/rust,ruud-v-a/rust,aepsil0n/rust,robertg/rust,P1start/rust,jroesch/rust,vhbit/rust,defuz/rust,andars/rust,miniupnp/rust,aturon/rust,krzysz00/rust,l0kod/rust,jbclements/rust,erickt/rust,dinfuehr/rust,dwillmer/rust,Ryman/rust,pelmers/rust,ejjeong/rust,l0kod/rust,cllns/rust,gifnksm/rust,robertg/rust,rohitjoshi/rust,graydon/rust,rprichard/rust,pshc/rust,vhbit/rust,servo/rust,KokaKiwi/rust,zubron/rust,pczarn/rust,mvdnes/rust,pczarn/rust,rprichard/rust,bluss/rand,seanrivera/rust,zubron/rust,bombless/rust,arthurprs/rand,seanrivera/rust,servo/rust,mdinger/rust,ktossell/rust,mihneadb/rust,mahkoh/rust,ruud-v-a/rust,cllns/rust,waynenilsen/rand,mihneadb/rust,kwantam/rust,defuz/rust,aneeshusa/rust,kimroen/rust,barosl/rust,nham/rust,aepsil0n/rust,emk/rust,untitaker/rust,quornian/rust,gifnksm/rust,andars/rust,avdi/rust,dinfuehr/rust,defuz/rust,gifnksm/rust,cllns/rust,emk/rust,philyoon/rust,0x73/rust,l0kod/rust,AerialX/rust-rt-minimal,bombless/rust,ruud-v-a/rust,omasanori/rust,P1start/rust,rohitjoshi/rust,philyoon/rust,GBGamer/rust,zachwick/rust,AerialX/rust-rt-minimal,pelmers/rust,victorvde/rust,zaeleus/rust,krzysz00/rust,0x73/rust,mdinger/rust,aneeshusa/rust,vhbit/rust,avdi/rust,jbclements/rust,erickt/rust,aturon/rust,vhbit/rust,barosl/rust,zaeleus/rust,pshc/rust,miniupnp/rust,miniupnp/rust,servo/rust,gifnksm/rust,jbclements/rust,omasanori/rust,huonw/rand,nwin/rust,hauleth/rust,avdi/rust,Ryman/rust,AerialX/rust-rt-minimal,victorvde/rust,quornian/rust,aidancully/rust,quornian/rust,krzysz00/rust,rprichard/rust,pczarn/rust,emk/rust,zubron/rust,aepsil0n/rust,jashank/rust,aidancully/rust,P1start/rust,quornian/rust,krzysz00/rust,nwin/rust,erickt/rust,sae-bom/rust,victorvde/rust,pshc/rust,XMPPwocky/rust,rprichard/rust,ruud-v-a/rust,GrahamDennis/rand,hauleth/rust,graydon/rust,miniupnp/rust,achanda/rand,barosl/rust,kimroen/rust,graydon/rust,miniupnp/rust,untitaker/rust,stepancheg/rust-ide-rust,quornian/rust,ktossell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