[basic.def.odr] Fix use of undefined term

Change "function definition scope" to "function parameter scope".

Author: lprv

source/basic.tex

@@ -597,7 +597,7 @@
 for each intervening scope\iref{basic.scope.scope}
 between the point at which the entity is introduced and the scope
 (where \tcode{*\keyword{this}} is considered to be introduced
-within the innermost enclosing class or non-lambda function definition scope),
+within the innermost enclosing class or non-lambda function parameter scope),
 either
 \begin{itemize}
 \item the intervening scope is a block scope,
@@ -621,7 +621,7 @@
 void f(int n) {
   [] { n = 1; };                // error: \tcode{n} is not odr-usable due to intervening lambda-expression
   struct A {
-    void f() { n = 2; }         // error: \tcode{n} is not odr-usable due to intervening function definition scope
+    void f() { n = 2; }         // error: \tcode{n} is not odr-usable due to intervening function parameter scope
   };
   void g(int = n);              // error: \tcode{n} is not odr-usable due to intervening function parameter scope
   [=](int k = n) {};            // error: \tcode{n} is not odr-usable due to being