Auto merge of #5222 - AdamNiederer:patch-1, r=matklad
Auto merge of #5222 - AdamNiederer:patch-1, r=matklad

Add docstrings to CleanOptions

vojtechkral/cargo,nipunn1313/cargo,rust-lang/cargo,rust-lang/cargo,tshepang/cargo,eminence/cargo,tsurai/cargo,rust-lang/cargo,eminence/cargo,tshepang/cargo,vojtechkral/cargo,eminence/cargo,vojtechkral/cargo,eminence/cargo,rustyhorde/cargo,nipunn1313/cargo,rustyhorde/cargo,tsurai/cargo,rustyhorde/cargo,tshepang/cargo,tsurai/cargo,rustyhorde/cargo,tsurai/cargo,rust-lang/cargo,tshepang/cargo,vojtechkral/cargo,nipunn1313/cargo,nipunn1313/cargo,tsurai/cargo