[intro.object] Clarify [intro.object]/3.1

There should be no logical circular dependency.

Author: frederick-vs-ja

source/basic.tex

@@ -3150,7 +3150,7 @@
 for the created object if:
 \begin{itemize}
 \item
-the lifetime of \placeholder{e} has begun and not ended, and
+the lifetime of \placeholder{e} has begun and not ended immediately before creating the new object, and
 \item
 the storage for the new object fits entirely within \placeholder{e}, and
 \item