The first sentence of a package, class or member contains {@docRoot}
appears in the alphabetic index as a kind of a summary. If that index
is generated *without* -splitindex, that {@docRoot} link is broken.

For example, for a first sentence in a class comment that links
to the package summary page, if the original first sentence is:

<A HREF="{@docRoot}/p1/package-summary.html#tests">To package tests</A>

I expect to get this in the index-all.html file:

<A HREF="./p1/package-summary.html#tests">To package tests</A>

but instead get this:

<A HREF="/p1/package-summary.html#tests">To package tests</A>