[fs.filesystem.error.members] fix missing 'is true'

Author: eisenwave

source/iostreams.tex

@@ -15368,10 +15368,10 @@
 \pnum
 \ensures
 \begin{itemize}
-\item \tcode{code() == ec},
-\item \tcode{path1().empty() == true},
-\item \tcode{path2().empty() == true}, and
-\item \tcode{string_view(what()).find(what_arg.c_str())} \tcode{!= string_view::npos}.
+\item \tcode{code() == ec} is \tcode{true},
+\item \tcode{path1().empty()} is \tcode{true},
+\item \tcode{path2().empty()} is \tcode{true}, and
+\item \tcode{string_view(what()).find(what_arg.c_str())} \tcode{!= string_view::npos} is \tcode{true}.
 \end{itemize}
 \end{itemdescr}
 
@@ -15384,10 +15384,10 @@
 \pnum
 \ensures
 \begin{itemize}
-\item \tcode{code() == ec},
+\item \tcode{code() == ec} is \tcode{true},
 \item \tcode{path1()} returns a reference to the stored copy of \tcode{p1},
-\item \tcode{path2().empty() == true}, and
-\item \tcode{string_view(what()).find(what_arg.c_str())} \tcode{!= string_view::npos}.
+\item \tcode{path2().empty()} is \tcode{true}, and
+\item \tcode{string_view(what()).find(what_arg.c_str())} \tcode{!= string_view::npos} is \tcode{true}.
 \end{itemize}
 \end{itemdescr}