Move error comment line in scoping example (#54790)

Continuation of #54500.
I realized the erroring line is one lower.

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

@@ -31,8 +31,8 @@ a global variable by the same name is allowed or not.
  ```julia
  # Print the numbers 1 through 5
  i = 0
- while i < 5 # ERROR: UndefVarError: `i` not defined
-  i += 1
+ while i < 5
+  i += 1 # ERROR: UndefVarError: `i` not defined
   println(i)
  end
  ```
@@ -43,8 +43,8 @@ a global variable by the same name is allowed or not.
  ```julia
  # Print the numbers 1 through 5
  let i = 0
-  while i < 5 # Now `i` is defined in the inner scope of the while loop
-  i += 1
+  while i < 5
+  i += 1 # Now outer `i` is defined in the inner scope of the while loop
   println(i)
   end
  end