doc: add info about the u64 wrapped in Result
doc: add info about the u64 wrapped in Result

GBGamer/rust,zubron/rust,GBGamer/rust,pshc/rust,graydon/rust,l0kod/rust,dwillmer/rust,graydon/rust,GBGamer/rust,l0kod/rust,zubron/rust,GBGamer/rust,pshc/rust,GBGamer/rust,pshc/rust,jashank/rust,dwillmer/rust,GBGamer/rust,aidancully/rust,graydon/rust,pshc/rust,l0kod/rust,dwillmer/rust,jashank/rust,dwillmer/rust,l0kod/rust,pshc/rust,GBGamer/rust,jashank/rust,aidancully/rust,aidancully/rust,jashank/rust,pshc/rust,zubron/rust,zubron/rust,graydon/rust,zubron/rust,aidancully/rust,GBGamer/rust,jashank/rust,jashank/rust,l0kod/rust,dwillmer/rust,aidancully/rust,graydon/rust,pshc/rust,pshc/rust,l0kod/rust,zubron/rust,zubron/rust,dwillmer/rust,aidancully/rust,graydon/rust,jashank/rust,l0kod/rust,zubron/rust,jashank/rust,l0kod/rust,dwillmer/rust,dwillmer/rust