README: output from -> output to (#3550)

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@ -136,7 +136,7 @@ These values can be piped through a series of steps, in a series of commands cal
In Unix, it's common to pipe between commands to split up a sophisticated command over multiple steps.
Nu takes this a step further and builds heavily on the idea of _pipelines_.
Just as the Unix philosophy, Nu allows commands to output from stdout and read from stdin.
Just as the Unix philosophy, Nu allows commands to output to stdout and read from stdin.
Additionally, commands can output structured data (you can think of this as a third kind of stream).
Commands that work in the pipeline fit into one of three categories: