Add weight percent formatters - #384

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Unexpected input(s) 'targets', valid inputs are ['toolchain', 'target', 'components', 'cache', 'cache-workspaces', 'cache-directories', 'cache-on-failure', 'cache-key', 'cache-shared-key', 'cache-bin', 'cache-provider', 'cache-all-crates', 'cache-workspace-crates', 'cache-save-if', 'cache-targets', 'matcher', 'rustflags', 'override', 'rust-src-dir']