Remove outdated note

fontspec.dtx

@@ -1609,8 +1609,7 @@ This work consists of this file fontspec.dtx
 % other, so you can enable them individually per character as shown in
 % \exref{cv2}. (Unlike stylistic alternates, say.)
 %
-% Note that the indexing starts from zero, which is compatible with \XeTeX\
-% but \emph{incompatible} with \texttt{luaotfload}, which starts from one.
+% Note that the indexing starts from zero.
 %
 % \begin{Lexample}[firstline=2]{cv}{The \feat{CharacterVariant} feature showing off Georg Duffner's open source Garamond revival font.}
 %   \huge
@@ -1645,8 +1644,7 @@ This work consists of this file fontspec.dtx
 %   \textsc{a} \& h
 % \end{Xexample}
 %
-% Note that the indexing starts from zero, which is compatible with plain \XeTeX\
-% but \emph{incompatible} with \texttt{luaotfload}, which starts from one.
+% Note that the indexing starts from zero.
 %
 % See \vref{sec:newfeatures} for a way to assign names to alternates,
 % which must be done on a per-font basis.
@@ -1807,8 +1805,7 @@ This work consists of this file fontspec.dtx
 %   \x0\x1\x2\x3\x4\x5\x6\x7\x7\x8\x9
 % \end{Xexample}
 %
-% Note that the indexing starts from zero, which is compatible with \XeTeX\
-% but \emph{incompatible} with \texttt{luaotfload}, which starts from one.
+% Note that the indexing starts from zero.
 %
 % \subsection{CJK shape}
 %