[any.class] Revert dot to comma typo from bdff868 (cplusplus#1795)

source/utilities.tex

@@ -5159,7 +5159,7 @@
 \pnum
 An object of class \tcode{any} stores an instance of any type that satisfies the constructor requirements or it has no value,
 and this is referred to as the \defn{state} of the class \tcode{any} object.
-The stored instance is called the \defnx{contained value}{contained value!\idxcode{any}},
+The stored instance is called the \defnx{contained value}{contained value!\idxcode{any}}.
 Two states are equivalent if either they both have no value, or both have a value and the contained values are equivalent.
 
 \pnum