describe how sub-encodings work with TS1 fonts (correctly I hope this…

… time)

base/changes.txt

@@ -6,6 +6,11 @@ completeness or accuracy and it contains some references to files that
 are not part of the distribution.
 ================================================================================
 
+2021-12-08  Frank Mittelbach  <Frank.Mittelbach@latex-project.org>
+
+	* lttextcomp.dtx (section{Sub-encodings}):
+	Describe correctly (I hope) how sub-encodings work for TS1.
+
 2021-11-18  Frank Mittelbach  <Frank.Mittelbach@latex-project.org>
 
 	* All *.dtx: Replaced \StopEventually by \MaybeStop

base/lttextcomp.dtx

@@ -25,9 +25,10 @@
 % and covered by LPPL is defined by the unpacking scripts (with
 % extension .ins) which are part of the distribution.
 %
+%%% From File: lttextcomp.dtx
+%
 % \fi
 %
-%%% From File: lttextcomp.dtx
 %
 % \iffalse
 %
@@ -36,7 +37,7 @@
 %
 %
 \ProvidesFile{lttextcomp.dtx}
-             [2021/04/16 v1.0f LaTeX Kernel (text companion symbols)]
+             [2021/12/09 v1.0f LaTeX Kernel (text companion symbols)]
 % \iffalse
 \documentclass{ltxdoc}
 \begin{document}
@@ -470,16 +471,18 @@
 %    \end{macrocode}
 %
 %
-%    In the following sections the remaining default definitions are ordered by
-%    sub-encoding in which they are become unavailable (i.e., they are
-%    not provided in the sub-encoding with that number and all
-%    sub-encodings with higher numbers.
+%    In the following sections the remaining default definitions are
+%    ordered by sub-encoding in which they are become
+%    \textbf{unavailable}, i.e., they are not provided in the
+%    sub-encoding with that number and all sub-encodings with higher
+%    numbers.
 %
-%    Thus the symbols that are available in sub-encoding $x$ are the
-%    symbols above (always available) and the symbols list in the
-%    sections for sub-encodings $x+1$ and higher.
+%    Thus, the symbols that are available in sub-encoding $x$ are the
+%    symbols above (always available) and the symbols listed below --- up
+%    to, but not including, the section titled ``\textbf{Unavailable in
+%    sub-encoding $x$ \ldots\ and higher}''.
 %
-% \subsection{Sub-encoding \texttt{1} (drop symbols not working in
+% \subsection{Unavailable in sub-encoding \texttt{1} and higher (drop symbols not working in
 %    Latin Modern)}
 %
 %    The \cs{textcircled} is available but the glyph is simply too
@@ -493,7 +496,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{2} (majority of new OTF fonts via autoinst)}
+% \subsection{Unavailable in sub-encoding \texttt{2}  (majority of new OTF fonts via autoinst) and higher}
 %
 %    \begin{macrocode}
 \DeclareTextCommandDefault{\t}
@@ -722,7 +725,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{3}}
+% \subsection{Unavailable in sub-encoding \texttt{3} and higher}
 %
 %    Sub-encoding \texttt{2} is the one where we loose many
 %    symbols. In the higher-numbered sub-encodings we see only a few
@@ -738,7 +741,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{4}}
+% \subsection{Unavailable in sub-encoding \texttt{4} and higher}
 %
 %    \begin{macrocode}
 \DeclareTextCommandDefault{\textcolonmonetary}
@@ -763,7 +766,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{5} (most older PS fonts)}
+% \subsection{Unavailable in sub-encoding \texttt{5} (most older PS fonts) and higher}
 %
 %    Most older PS fonts (supported in \TeX{} since the early nineties
 %    when virtual fonts became available) are sorted under this
@@ -790,7 +793,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{6}}
+% \subsection{Unavailable in sub-encoding \texttt{6} and higher}
 %
 %    \begin{macrocode}
 \DeclareTextCommandDefault{\textflorin}
@@ -801,7 +804,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{7}}
+% \subsection{Unavailable in sub-encoding \texttt{7} and higher}
 %
 %    \begin{macrocode}
 \DeclareTextCommandDefault{\textfractionsolidus}
@@ -816,7 +819,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{8}}
+% \subsection{Unavailable in sub-encoding \texttt{8} and higher}
 %
 %    \begin{macrocode}
 \DeclareTextCommandDefault{\textblank}
@@ -837,7 +840,7 @@
 %
 %
 %
-% \subsection{Sub-encoding \texttt{9} (most missing)}
+% \subsection{Unavailable in Sub-encoding \texttt{9} (most missing)}
 %
 %    \begin{macrocode}
 \DeclareTextCommandDefault{\textcelsius}