tour: adds additional info RE 'else' command

[JackMead]

Fixes #442

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[gopherbot]

This PR is being closed because golang.org/cl/141197 has been abandoned.

Closing because x/tour content moved to x/website (see CL 324309), leaving only a few supporting Go packages. If this change still applies, it'd need to be re-sent it to x/website. Thanks.