Editorial: Fix minor typo "sytem"

[mk-pmb]

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[a-sully]

Thanks for noticing and fixing this!

[a-sully]

Hi @mk-pmb, contributors to this repo need to sign the participant agreement. Please let me know which of the following options you prefer:

1. Sign the participant agreement, then we can merge this PR. Apologies for the burden, but once this is signed we welcome future contributions!
2. To get around this requirement for a trivial change like this, I can close this PR, make the change myself, and acknowledge you in the PR description

[mk-pmb]

Let's pick the easy (2nd) route.

[a-sully]

SGTM. Created #141

[mk-pmb]

On a side note, I was curious what the participant agreement would be. In the WHATWG FAQ I found the "participate" button which leads to https://participate.whatwg.org/ , but there I was blocked by CloudFlare. A futile annoyance, as I can still read it on the Wayback Machine.
I know WHATWG somehow loves CloudFlare but I still believe they should use something that grants even suspicious people at least read-only access. Ideally something that also is not a danger to the open internet.