[docs] Remove "The adapter API may change before 1.0." (sveltejs#8164)

Author: lukaszpolowczyk

documentation/docs/20-core-concepts/50-adapters.md

@@ -112,5 +112,3 @@ Within the `adapt` method, there are a number of things that an adapter should d
 - Put the user's static files and the generated JS/CSS in the correct location for the target platform
 
 Where possible, we recommend putting the adapter output under the `build/` directory with any intermediate output placed under `.svelte-kit/[adapter-name]`.
-
-> The adapter API may change before 1.0.