Avoid nested dollar math.

Because cxxdraft-htmlgen does not support it.

source/containers.tex

@@ -18945,7 +18945,7 @@
 
 \pnum
 An integer $r$ is a \defn{rank index} of an index space $S$
-if $r$ is in the range $[0, \text{rank of $S$})$.
+if $r$ is in the range $[0, \text{rank of }S)$.
 
 \pnum
 A pack of integers \tcode{idx} is
@@ -21748,13 +21748,13 @@
 \item
 if $S_k$ is a specialization of \tcode{strided_slice}
   \begin{itemize}
-  \item $\tcode{$s_k$.extent = 0}$, or
-  \item $\tcode{$s_k$.stride > 0}$
+  \item $s_k\tcode{.extent} = 0$, or
+  \item $s_k\tcode{.stride} > 0$
   \end{itemize}
 \item
-$0 \le \tcode{\exposid{first_}<IndexType, $k$>(slices...)}$
-$\le \tcode{\exposid{last_}<$k$>(src, slices...)}$
-$\le \tcode{src.extent($k$)}$
+$0 \le \exposid{first_}\tcode{<IndexType, }k\tcode{>(slices...)}$
+$\le \exposid{last_}\tcode{<}k\tcode{>(src, slices...)}$
+$\le \tcode{src.extent(}k\tcode{)}$
 \end{itemize}
 
 \pnum
@@ -21871,13 +21871,13 @@
 \item
 if $S_k$ is a specialization of \tcode{strided_slice}
   \begin{itemize}
-  \item $\tcode{$s_k$.extent} = 0$, or
-  \item $\tcode{$s_k$.stride} > 0$
+  \item $s_k\tcode{.extent} = 0$, or
+  \item $s_k\tcode{.stride} > 0$
   \end{itemize}
 \item
-$0            \le \tcode{\exposid{first_}<index_type, $k$>(slices...)} \\
-\hphantom{0 } \le \tcode{\exposid{last_}<$k$>(extents(), slices...)} \\
-\hphantom{0 } \le \tcode{extents().extent($k$)}$
+$0            \le \exposid{first_}\tcode{<index_type, }k\tcode{>(slices...)} \\
+\hphantom{0 } \le \exposid{last_}\tcode{<}k\tcode{>(extents(), slices...)} \\
+\hphantom{0 } \le \tcode{extents().extent(}k\tcode{)}$
 \end{itemize}
 
 \pnum
@@ -22036,13 +22036,13 @@
   \item
   if $S_k$ is a specialization of \tcode{strided_slice}
     \begin{itemize}
-    \item $\tcode{$s_k$.extent} = 0$, or
-    \item $\tcode{$s_k$.stride} > 0$
+    \item $s_k\tcode{.extent} = 0$, or
+    \item $s_k\tcode{.stride} > 0$
     \end{itemize}
   \item
-  $0 \le \tcode{\exposid{first_}<index_type, $k$>(slices...)}$
-  $\le \tcode{\exposid{last_}<$k$>(src.extents(), slices...)}$
-  $\le \tcode{\linebreak{}src.extent($k$)}$
+  $0 \le \exposid{first_}\tcode{<index_type, }k\tcode{>(slices...)}
+  \le \exposid{last_}\tcode{<}k\tcode{>(src.extents(), slices...)}
+  \le \tcode{src.extent(}k\tcode{)}$
   \end{itemize}
 
 \item