doc: Fix some markup whitespace issues

doc: Fix some markup whitespace issues

When making an xref to a varlistentry, the stylesheets use the first
<term> as the link text.  In the cases fixed here, the <term> element
contained extra whitespace that ended up being part of the link text,
which looked strange in the output in some cases.  This whitespace is
significant, so remove it since we don't want it.