schema: remove leftover doc comment part (tmc#784)

schema/doc.go

@@ -1,10 +1,3 @@
 // Package schema implements a shared core set of data types for use in
 // langchaingo.
-//
-// The primary interface through which end users interact with LLMs is a chat
-// interface. For this reason, some model providers have started providing
-// access to the underlying API in a way that expects chat messages. These
-// messages have a content field (which is usually text) and are associated
-// with a user (or role). Right now the supported users are System, Human, AI,
-// and a generic/arbitrary user.
 package schema