Remove hardcoded references to \textsc{metropolis}

Use \themename in documentation instead.

source/beamercolorthememetropolis.dtx

@@ -27,7 +27,7 @@
 %<*package>
 % ------------------------------------------------------------------------- \fi
 %
-% \subsection{\textsc{metropolis} color theme}
+% \subsection{\themename color theme}
 %
 % Load required packages.
 %    \begin{macrocode}
@@ -90,8 +90,8 @@
 %
 % \subsubsection{Base styles}
 %
-% All colors in the \textsc{metropolis} theme are derived from the definitions
-% of |normal text|, |alerted text|, and |example text|.
+% All colors in \themename are derived from the definitions of |normal text|,
+% |alerted text|, and |example text|.
 %
 %    \begin{macrocode}
 \newcommand{\@metropolis@colors@dark}{
@@ -133,8 +133,8 @@
 %    \end{macrocode}
 %
 % The “primary” palette should be used for the most important navigational
-% elements, and possibly of other elements. The \textsc{metropolis} theme uses
-% it for frame titles and slides.
+% elements, and possibly of other elements. \themename uses it for frame
+% titles and slides.
 %
 %    \begin{macrocode}
 \setbeamercolor{palette primary}{%
@@ -148,7 +148,7 @@
 }
 %    \end{macrocode}
 %
-% The \textsc{metropolis} inner or outer themes optionally display progress
+% The \themename inner or outer themes optionally display progress
 % bars in various locations. Their color is set by |progress bar| but the two
 % different kinds can be customized separately. The horizontal rule on the
 % title page is also set based on the progress bar color and can be customized

source/beamerfontthememetropolis.dtx

@@ -26,8 +26,8 @@
 % \iffalse
 %<*package>
 % ------------------------------------------------------------------------- \fi
-% \subsection{\textsc{metropolis} font theme}
 %
+% \subsection{\themename font theme}
 %
 % Load required packages.
 %    \begin{macrocode}

source/beamerinnerthememetropolis.dtx

@@ -27,7 +27,7 @@
 %<*package>
 % ------------------------------------------------------------------------- \fi
 %
-% \subsection{\textsc{metropolis} inner theme}
+% \subsection{\themename inner theme}
 %
 % A |beamer| inner theme dictates the style of the frame elements traditionally
 % set in the ``body'' of each slide. These include:

source/beamerouterthememetropolis.dtx

@@ -27,7 +27,7 @@
 %<*package>
 % ------------------------------------------------------------------------- \fi
 %
-% \subsection{\textsc{metropolis} outer theme}
+% \subsection{\themename outer theme}
 %
 % A |beamer| outer theme dictates the style of the frame elements traditionally
 % set outside the body of each slide: the head, footline, and frame title.
@@ -148,7 +148,7 @@
 % \subsubsection{Head and footline}
 %
 % All good |beamer| presentations should already remove the navigation symbols,
-% but \textsc{metropolis} removes them automatically (just in case).
+% but \themename removes them automatically (just in case).
 %
 %    \begin{macrocode}
 \setbeamertemplate{navigation symbols}{}

source/beamerthememetropolis.dtx

@@ -27,10 +27,10 @@
 %<*package>
 % ------------------------------------------------------------------------- \fi
 %
-% \subsection{\textsc{metropolis} main theme}
+% \subsection{\themename parent theme}
 %
 % The primary job of this package is to load the component sub-packages of the
-% \textsc{metropolis} theme and route the theme options accordingly. It also
+% \themename theme and route the theme options accordingly. It also
 % provides some custom commands and environments for the user.
 %
 % Load the required packages.