Auto merge of #4441 - vignesh-sankaran:manifest-doc-fix, r=alexcrichton
Auto merge of #4441 - vignesh-sankaran:manifest-doc-fix, r=alexcrichton

Replace maintenance status with ellipses

Since the default maintenance status isn't set to none if it isn't set, feel it'd be more appropriate to have ellipses instead like the other badge docs.

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