tweak docs

Author: Rich-Harris

packages/svelte/messages/compile-warnings/template.md

@@ -56,7 +56,11 @@ This code will work when the component is rendered on the client (which is why t
 
 ## svelte_component_deprecated
 
-> `svelte:component` has been deprecated, you can just render the component with `<Component />`
+> `<svelte:component>` is deprecated in runes mode — components are dynamic by default
+
+In previous versions of Svelte, the component constructor was fixed when the component was rendered. In other words, if you wanted `<X>` to re-render when `X` changed, you would either have to use `<svelte:component this={X}>` or put the component inside a `{#key X}...{/key}` block.
+
+In Svelte 5 this is no longer true — if `X` changes, `<X>` re-renders. For more complex expressions like `condition ? Y : Z` you can use a derived value instead.
 
 ## svelte_element_invalid_this
 

packages/svelte/src/compiler/warnings.js

@@ -769,11 +769,11 @@ export function slot_element_deprecated(node) {
 }
 
 /**
- * `svelte:component` has been deprecated, you can just render the component with `<Component />`
+ * `<svelte:component>` is deprecated in runes mode — components are dynamic by default
  * @param {null | NodeLike} node
  */
 export function svelte_component_deprecated(node) {
-	w(node, "svelte_component_deprecated", "`svelte:component` has been deprecated, you can just render the component with `<Component />`");
+	w(node, "svelte_component_deprecated", "`<svelte:component>` is deprecated in runes mode — components are dynamic by default");
 }
 
 /**

packages/svelte/tests/validator/samples/attribute-quoted/warnings.json

@@ -17,7 +17,7 @@
 			"column": 45,
 			"line": 15
 		},
-		"message": "`svelte:component` has been deprecated, you can just render the component with `<Component />`",
+		"message": "`<svelte:component>` is deprecated in runes mode — components are dynamic by default",
 		"start": {
 			"column": 0,
 			"line": 15

packages/svelte/tests/validator/samples/svelte-component-deprecated/warnings.json

@@ -1,7 +1,7 @@
 [
 	{
 		"code": "svelte_component_deprecated",
-		"message": "`svelte:component` has been deprecated, you can just render the component with `<Component />`",
+		"message": "`<svelte:component>` is deprecated in runes mode — components are dynamic by default",
 		"start": {
 			"line": 7,
 			"column": 0