These are updates to several links in the documentation that are not
currently pointing to existing anchors in the documentation, these were
found using the unfinished version of the mdbook-linkchecker we are
working on.
Fixes include pointing them to the correct anchor, inserting anchors (in
updated html5 style, though debatable) and in the case of the historical
release notes, removing them, fixing #809.
Change-Id: If4ef89dc89506aa131a764312d97a86179ccd6f5