Tentative: update point E. Host Language Label of the Acc Name algorithm

[giacomo-petri]

Closes: w3c/accname#108

This change clarifies the following:

• The term "element" in "unless the element is marked as presentational" is replaced with "current node" for clarity.
• The ambiguity regarding presentational role conflicts is removed by replacing "marked as decorative" with "exposed as decorative." Replacing this eliminates the need for additional notes, where we would need to clarify that "marked as decorative" could cause presentational role conflicts, which, for this point of the algorithm, should be resolved by ignoring the "marked as decorative" bit. Moreover, this would introduce complexity, as the statement "If exposing the explicit role causes the accessibility tree to be malformed, the expected results are undefined" adds further complications.

Should this be marked as editorial?

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