Document make install-docs.
<Term><Literal>install</Literal>:</Term>
<ListItem>
<para>
<Term><Literal>install</Literal>:</Term>
<ListItem>
<para>
-installs the things built by <Literal>all</Literal>. Where does it
+installs the things built by <Literal>all</Literal> (except for the documentation). Where does it
install them? That is specified by
<filename>mk/config.mk.in</filename>; you can override it in
<filename>mk/build.mk</filename>, or by running
install them? That is specified by
<filename>mk/config.mk.in</filename>; you can override it in
<filename>mk/build.mk</filename>, or by running
</para>
</ListItem></VarListEntry>
<VarListEntry>
</para>
</ListItem></VarListEntry>
<VarListEntry>
+<Term><Literal>install-docs</Literal>:</Term>
+<ListItem>
+<para>
+installs the documentation. Otherwise behaves just like <literal>install</literal>.
+</para>
+</ListItem></VarListEntry>
+<VarListEntry>
<Term><Literal>uninstall</Literal>:</Term>
<ListItem>
<para>
<Term><Literal>uninstall</Literal>:</Term>
<ListItem>
<para>