chore: fix typo of selectionchange

[wyattzheng]

For normative changes, the following tasks have been completed:

• Editing WG resolution on the proposed changes, with at least two implementers participating and not objecting:

  • WebKit
  • Chromium
  • Gecko

• For browsers that are shipping the feature, implementation bugs are filed for the proposed changes (link to bug, or write "Not Implementing"):

  • WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
  • Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
  • Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)

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[w3cbot]

siusin marked as non substantive for IPR from ash-nazg.

[rniwa]

Thanks for the fix!