docs: fix comment in README for Hook’s after method (#1103)

## This PR

- Fixes incorrect comment in the README for the Hook implementation's
`after` method.

Signed-off-by: Christian Llontop <me@chrisllontop.com>

packages/server/README.md

@@ -383,7 +383,7 @@ import type { Hook, HookContext, EvaluationDetails, FlagValue } from "@openfeatu
 
 export class MyHook implements Hook {
   after(hookContext: HookContext, evaluationDetails: EvaluationDetails<FlagValue>) {
-    // code that runs when there's an error during a flag evaluation
+    // code that runs after flag values are successfully resolved from the provider
   }
 }
 ```