Avoid nested dollar math.

Eelis · Eelis · commit fd0486f2d8a1 · 2023-07-22T08:03:27.000+02:00
Because cxxdraft-htmlgen does not support it.
diff --git a/source/containers.tex b/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
