docs: fix unformatted code blocks in README

[SamuAlfageme]

What this PR does / why we need it: there were a couple of unformatted code blocks on the README that just triggered my OCD. This makes the fact that it is meant to run in the terminal more explicit.

How does this change affect the cardinality of KSM: does not change cardinality. Documentation-only.

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• ✅ login: SamuAlfageme / name: Samuel Alfageme Sainz (3a10a4e)

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[mrueg]

Thanks for the PR, in order to make this change work, you'll need to adjust the README.md.tpl and then render the README.md from that.

[SamuAlfageme]

@mrueg oh, snap! I'll do that asap. Thanks for the explanation!

[mrueg]

/lgtm

Thanks!

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