Clean up the v2 manual a bit
includes: - running each example through `goimports` - wrapping text at ~80 cols - consistently using `&cli.App{...}` - consistently using code example gates - removing trailing blankspace
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includes: - running each example through `goimports` - wrapping text at ~80 cols - consistently using `&cli.App{...}` - consistently using code example gates - removing trailing blankspace