Blend new F.47 into existing text.

tituswinters · tituswinters · commit fea884184e7f · 2015-12-15T11:48:04.000-05:00
diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
@@ -1820,6 +1820,7 @@ Value return semantic rules:
 * [F.44: Return a `T&` when "returning no object" isn't an option](#Rf-return-ref)
 * [F.45: Don't return a `T&&`](#Rf-return-ref-ref)
 * [F.46: `int` is the return type for `main()`](#Rf-main)
+* [F.47: Return `T&` from assignment operators.](#Rf-assignment-op)
 
 Other function rules:
 
@@ -2258,7 +2259,7 @@ For advanced uses (only), where you really need to optimize for rvalues passed t
 Avoid "esoteric techniques" such as:
 
 * Passing arguments as `T&&` "for efficiency". Most rumors about performance advantages from passing by `&&` are false or brittle (but see [F.25](#Rf-pass-ref-move).)
-* Returning `const T&` from assignments and similar operations.
+* Returning `const T&` from assignments and similar operations (see [F.47](#Rf-assignment-op).)
 
 ##### Example
 
@@ -2873,7 +2874,7 @@ Declaring `main` (the one global `main` of a program) `void` limits portability.
 * The compiler should do it
 * If the compiler doesn't do it, let tools flag it
 
-### <a name="Rf-assignment-op"></a>F.46: Return `T&` from assignment operators.
+### <a name="Rf-assignment-op"></a>F.47: Return `T&` from assignment operators.
 
 ##### Reason
 
