I ran into a few relative links that didn't work right either in the
original context or in the re-exported context. afaict letting Cargo
figure out the links works better now.

I used the following definitely very robust and obvious invocation:

    find -name \*.rs -exec sed -i -e '
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./\w\+\.\(\w\+\)\.html@\1super::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./\(\w\+\)/\w\+\.\(\w\+\)\.html@\1super::\2::\3@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./\.\./\w\+\.\(\w\+\)\.html@\1super::super::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./\.\./\(\w\+\)/\w\+\.\(\w\+\)\.html@\1super::super::\2::\3@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./\(\w\+\)/index\.html@\1super::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./index\.html@\1super@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\.\./\(\w\+\)/\?$@\1super::\2@;

        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\./\w\+\.\(\w\+\)\.html@\1self::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\./\(\w\+\)/\w\+\.\(\w\+\)\.html@\1self::\2::\3@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\./\(\w\+\)/index\.html@\1self::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\./index\.html@\1self@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\./\(\w\+\)/\?$@\1self::\2@;

        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\w\+\.\(\w\+\)\.html@\1self::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\(\w\+\)/\w\+\.\(\w\+\)\.html@\1self::\2::\3@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\(\w\+\)/index\.html@\1self::\2@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?index\.html@\1self@;
        s@\(//. \[[^]]*\]:\s\+\)[:"]\?\(\w\+\)/\?$@\1self::\2@;

        s@\(//. \[[^]]*\]:\s\+[A-Za-z_0-9:]\+\)#method\.\(\w\+\)@\1::\2@;
    ' {} +

I didn't sed very cleverly so a lot of stuff came out wrong or at least
ambiguous and awkward, unsurprisingly, so here is some manual fixing-up.

afaict `Callsite:id` hasn't existed in a long time so I went and also
removed other mentions of it.