chore: bette phrasing for docs and error

Co-authored-by: Matei Trandafir <[email protected]>

Author: paoloricciuti

documentation/docs/02-runes/02-$state.md

@@ -149,7 +149,7 @@ This can improve performance with large arrays and objects that you weren't plan
 
 ## State options
 
-Both `$state` and `$state.raw` can optionally accept a second argument. This argument allow you to specify an `onchange` function that will be called synchronously whenever the object change (for `$state` it will also be called for deep mutations).
+Both `$state` and `$state.raw` can optionally accept a second argument. This allows you to specify an `onchange` function that will be called synchronously whenever the state value changes (for `$state` it will also be called for deep mutations).
 
 The `onchange` function is untracked so even if you assign within an `$effect` it will not cause unwanted dependencies.
 

packages/svelte/src/compiler/phases/2-analyze/visitors/CallExpression.js

@@ -88,7 +88,7 @@ export function CallExpression(node, context) {
 			if ((rune === '$derived' || rune === '$derived.by') && node.arguments.length !== 1) {
 				e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
 			} else if (rune === '$state' && node.arguments.length > 2) {
-				e.rune_invalid_arguments_length(node, rune, 'zero, one or two arguments');
+				e.rune_invalid_arguments_length(node, rune, 'at most two arguments');
 			}
 
 			break;

packages/svelte/tests/compiler-errors/samples/runes-wrong-state-args/_config.js

@@ -3,6 +3,6 @@ import { test } from '../../test';
 export default test({
 	error: {
 		code: 'rune_invalid_arguments_length',
-		message: '`$state` must be called with zero, one or two arguments'
+		message: '`$state` must be called with at most two arguments'
 	}
 });