update wording in 'how-ipfs-works'

[shorsher]

Describe your changes

Just updating the wording of a few sentences I noticed while reading.

Files changed

• docs/concepts/how-ipfs-works.md

What issue(s) does this address?

N/A

Does this update depend on any other PRs?

N/A

Checklist before requesting a review

• Passing the beta version of the Check Markdown links for modified files check. Action results can be viewed here.

Checklist before merging

• Passing all required checks (The beta Check Markdown links for modified files check is not required)

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[ElPaisano]

LGTM, thank you!