add local to outer description (#29010)

doc/src/manual/variables-and-scoping.md

@@ -449,7 +449,7 @@ julia> f()
 0
 ```
 
-However, it is occasionally useful to reuse an existing variable as the iteration variable.
+However, it is occasionally useful to reuse an existing local variable as the iteration variable.
 This can be done conveniently by adding the keyword `outer`:
 
 ```jldoctest

src/julia-syntax.scm

@@ -2430,7 +2430,7 @@
          '(null))
         ((eq? (car e) 'require-existing-local)
          (if (not (memq (cadr e) env))
-             (error "no outer variable declaration exists for \"for outer\""))
+             (error "no outer local variable declaration exists for \"for outer\""))
          '(null))
         ((eq? (car e) 'lambda)
          (let* ((lv   (lam:vars e))

test/core.jl

@@ -3256,7 +3256,7 @@ let
     @test forouter() == 3
 end
 
-@test_throws ErrorException("syntax: no outer variable declaration exists for \"for outer\"") @eval function f()
+@test_throws ErrorException("syntax: no outer local variable declaration exists for \"for outer\"") @eval function f()
     for outer i = 1:2
     end
 end