docs: specify that the 'form' navigation type only applies to method="GET" (#10269)

Closes #10237

This makes it clear in the docs that $navigating.type is only 'form' when a <form method="GET"> has been submitted, not for POSTs.

Author: geoffrich

.changeset/tough-weeks-join.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+docs: update inline NavigationType documentation

packages/kit/src/exports/public.d.ts

@@ -821,7 +821,7 @@ export interface NavigationTarget {
 
 /**
  * - `enter`: The app has hydrated
- * - `form`: The user submitted a `<form>`
+ * - `form`: The user submitted a `<form>` with a GET method
  * - `leave`: The user is leaving the app by closing the tab or using the back/forward buttons to go to a different document
  * - `link`: Navigation was triggered by a link click
  * - `goto`: Navigation was triggered by a `goto(...)` call or a redirect