ES.45/ES.46: renamed and reordered to match jump tags

The anchors later in the file were using 46 for narrowing and 45 for
magic.  Renamed and reordered the tags in the TOC to match.

CppCoreGuidelines.md

@@ -9186,8 +9186,8 @@ Expression rules:
 * [ES.42: Keep use of pointers simple and straightforward](#Res-ptr)
 * [ES.43: Avoid expressions with undefined order of evaluation](#Res-order)
 * [ES.44: Don't depend on order of evaluation of function arguments](#Res-order-fct)
-* [ES.45: Avoid narrowing conversions](#Res-narrowing)
-* [ES.46: Avoid "magic constants"; use symbolic constants](#Res-magic)
+* [ES.45: Avoid "magic constants"; use symbolic constants](#Res-magic)
+* [ES.46: Avoid narrowing conversions](#Res-narrowing)
 * [ES.47: Use `nullptr` rather than `0` or `NULL`](#Res-nullptr)
 * [ES.48: Avoid casts](#Res-casts)
 * [ES.49: If you must use a cast, use a named cast](#Res-casts-named)