Add missing subcommands to zsh auto-completion
Add missing subcommands to zsh auto-completion

Specifically, rustc, rustdoc, search, and uninstall.

eminence/cargo,eminence/cargo,mark-buer/cargo,brson/cargo,cmr/cargo,gchp/cargo,brson/cargo,AndiDog/cargo,ThinTim/cargo,sbeckeriv/cargo,brson/cargo,tsurai/cargo,tsurai/cargo,blaenk/cargo,rustyhorde/cargo,rust-lang/cargo,mark-buer/cargo,durka/cargo,blaenk/cargo,AndiDog/cargo,eminence/cargo,nipunn1313/cargo,gchp/cargo,rustyhorde/cargo,AndiDog/cargo,sbeckeriv/cargo,ThinTim/cargo,tsurai/cargo,achanda/cargo,cmr/cargo,rust-lang/cargo,ThinTim/cargo,mark-buer/cargo,sbeckeriv/cargo,tsurai/cargo,ThinTim/cargo,cmr/cargo,rust-lang/cargo,vojtechkral/cargo,tshepang/cargo,achanda/cargo,brson/cargo,durka/cargo,gchp/cargo,eminence/cargo,durka/cargo,AndiDog/cargo,brson/cargo,rustyhorde/cargo,achanda/cargo,nipunn1313/cargo,cmr/cargo,gchp/cargo,nipunn1313/cargo,cmr/cargo,mark-buer/cargo,tsurai/cargo,gchp/cargo,blaenk/cargo,tshepang/cargo,rustyhorde/cargo,tshepang/cargo,vojtechkral/cargo,blaenk/cargo,nipunn1313/cargo,mark-buer/cargo,AndiDog/cargo,rust-lang/cargo,achanda/cargo,durka/cargo,ThinTim/cargo,vojtechkral/cargo,tshepang/cargo,sbeckeriv/cargo,blaenk/cargo,vojtechkral/cargo