[heycam/webidl] Fix a wrong description `[LenientThis]` (#560)

In the section of `[LenientSetter]`, a sentence commented on `[LenientThis]` by mistake.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/560

-- Commit Summary --

  * Update index.bs

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/560.patch
https://github.com/heycam/webidl/pull/560.diff

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