[expr.reinterpret.cast] Clarify that pointer->int type restriction looks at the type not the pointer value.

We were imprecise in what we meant by "large enough to hold it", but the intent is clear.

Author: zygoloid

source/expressions.tex

@@ -3110,7 +3110,7 @@
 \indextext{cast!reinterpret!pointer to integer}%
 \indextext{cast!pointer to integer}%
 A pointer can be explicitly converted to any integral type large enough
-to hold it.
+to hold all values of its type.
 \indextext{conversion!implementation-defined pointer integer}%
 The mapping function is \impldef{mapping of pointer to integer}.
 \begin{note}