[stack.ops] fix indentation

Author: jwakely

source/containers.tex

@@ -14499,7 +14499,7 @@
 \indexlibrarymember{operator>=}{stack}%
 \begin{itemdecl}
 template<class T, class Container>
-    bool operator>=(const stack<T, Container>& x, const stack<T, Container>& y);
+  bool operator>=(const stack<T, Container>& x, const stack<T, Container>& y);
 \end{itemdecl}
 
 \begin{itemdescr}