[text.encoding.aliases] Use code font for class name in heading (#6769)

Author: jwakely

source/locales.tex

@@ -5048,7 +5048,7 @@
 if and only if \tcode{i != id::other} is \tcode{true}.
 \end{itemdescr}
 
-\rSec3[text.encoding.aliases]{Class text_encoding::aliases_view}
+\rSec3[text.encoding.aliases]{Class \tcode{text_encoding::aliases_view}}
 
 \indexlibrarymember{aliases_view}{text_encoding}%
 \indexlibrarymember{begin}{text_encoding::aliases_view}%