fix: golangci-lint 2 fixes (#769)

textarea/memoization/memoization.go

@@ -1,3 +1,5 @@
+// Package memoization is an internal package that provides a simple memoization
+// for text area.
 package memoization
 
 import (

textarea/textarea.go

@@ -1,3 +1,5 @@
+// Package textarea provides a multi-line text input component for Bubble Tea
+// applications.
 package textarea
 
 import (