Update structs.md

Author: ice-cap0

lib/elixir/pages/getting-started/structs.md

@@ -78,25 +78,25 @@ For more details on creating, updating, and pattern matching structs, see the do
 
 ## Dynamic struct updates
 
-When you need to update structs with data from variables or external sources, use `struct!/2`:
+When you need to update structs with data from keyword lists or maps, use `Kernel.struct!/2`:
 
 ```elixir
 iex> john = %User{name: "John", age: 27}
 %User{age: 27, name: "John"}
-iex> struct!(john, name: "Jane", age: 30)
-%User{age: 30, name: "Jane"}
+iex> updates = [name: "Jane", age: 30]
+[name: "Jane", age: 30]
+iex> struct!(john, updates)
+%User{age: 27, name: "Jane"}
 ```
 
-Unlike the update syntax, `struct!/2` accepts data from maps and keyword lists, and will raise an error if you try to set invalid fields:
+`struct!/2` will raise an error if you try to set invalid fields:
 
 ```elixir
-iex> fields = [name: "Jane", invalid: "field"]
-[name: "Jane", invalid: "field"]
-iex> struct!(john, fields)
+iex> struct!(john, invalid: "field")
 ** (KeyError) key :invalid not found in: %User{age: 27, name: "John"}
 ```
 
-Always use `struct!/2` instead of `Map` functions when working with structs, as functions like `Map.put/3` and `Map.merge/2` can break struct integrity. See the [`Kernel.struct!/2`](https://hexdocs.pm/elixir/Kernel.html#struct!/2) documentation for more details.
+Use the map update syntax (`%{john | name: "Jane"}`) when you know the exact fields at compile time. Always use `struct!/2` instead of `Map` functions to preserve struct integrity.
 
 ## Structs are bare maps underneath