godoc: moves sealed type notes to the top and backfills where missing (#1397)

wazero uses interfaces even when they aren't intended to be implemented
by users. We relied on documentation, to suggest what is implementable,
and in some cases documented correctly types that weren't for
implementation.

However, we didn't add that boilerplate to all types, and we also forgot
to recently when it was discussed a week or two ago. This finishes the
job by boilerplating all types that aren't for implementation. This also
orders to the top when it already existed.

Later, we can choose to enforce by type as well, we didn't know how to
do that before. Basically before we just casted to our internal types,
which would stop accidental implementation for things except people
using the types for wrapping purposes.

Signed-off-by: Adrian Cole <adrian@tetrate.io>

builder.go

@@ -32,6 +32,11 @@ import (
 //		x, _ := m.Memory().ReadUint32Le(ctx, offset)
 //		return x
 //	}
+//
+// # Notes
+//
+//   - This is an interface for decoupling, not third-party implementations.
+//     All implementations are in wazero.
 type HostFunctionBuilder interface {
 	// WithGoFunction is an advanced feature for those who need higher
 	// performance than WithFunc at the cost of more complexity.
@@ -166,6 +171,8 @@ type HostFunctionBuilder interface {
 //
 // # Notes
 //
+//   - This is an interface for decoupling, not third-party implementations.
+//     All implementations are in wazero.
 //   - HostModuleBuilder is mutable: each method returns the same instance for
 //     chaining.
 //   - methods do not return errors, to allow chaining. Any validation errors