[basic.scope.scope] Update the note about special cases

Author: Endilll

source/basic.tex

@@ -933,8 +933,9 @@
 certain \grammarterm{elaborated-type-specifier}s\iref{dcl.type.elab}
 target a larger enclosing scope.
 \item
-Block-scope extern declarations target a larger enclosing scope
-but bind a name in their immediate scope.
+Declarations in block scope that have \tcode{extern} specifier
+or declare a function target an innermost namespace scope
+but bind a name in their immediate scope\iref{dcl.meaning}.
 \item
 The names of unscoped enumerators are bound
 in the two innermost enclosing scopes\iref{dcl.enum}.