[whatwg/encoding] Editorial style nits (#76)

Class names like Uint8Array, ArrayBuffer, TypeError, and RangeError should link to their definitions.

For associated "internal slots" (e.g. encoding, error mode, ignore BOM flag, etc.), their defining instance should be a `<dfn>`, and all subsequent uses of or references to them should be `<a>`s. Currently both are `<b>`.

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