clarify "other" navs can reference remote resources #1246
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The 3.1 revision clarified that nav element can reference remote resources so long as they aren't one of the three epub-defined lists (toc, landmarks, page-list).
Unfortunately, we ended up with the following overly-liberal sounding statement:
As noted w3c/epubcheck#890, this sounds contradictory to the requirement that all linked resources have to be in the spine. This PR fixes the statement with the following alternative wording: