fix comments (#13404)

Co-authored-by: shota.silagadze <shota.silagadze@taal.com>

erigon-lib/kv/kv_interface.go

@@ -240,19 +240,7 @@ type RoDB interface {
 	ReadOnly() bool
 	View(ctx context.Context, f func(tx Tx) error) error
 
-	// BeginRo - creates transaction
-	// 	tx may be discarded by .Rollback() method
-	//
-	// A transaction and its cursors must only be used by a single
-	// 	thread (not goroutine), and a thread may only have a single transaction at a time.
-	//  It happen automatically by - because this method calls runtime.LockOSThread() inside (Rollback/Commit releases it)
-	//  By this reason application code can't call runtime.UnlockOSThread() - it leads to undefined behavior.
-	//
-	// If this `parent` is non-NULL, the new transaction
-	//	will be a nested transaction, with the transaction indicated by parent
-	//	as its parent. Transactions may be nested to any level. A parent
-	//	transaction and its cursors may not issue any other operations than
-	//	Commit and Rollback while it has active child transactions.
+	// BeginRo - creates transaction, must not be moved between gorotines
 	BeginRo(ctx context.Context) (Tx, error)
 	AllTables() TableCfg
 	PageSize() datasize.ByteSize
@@ -291,6 +279,19 @@ type RwDB interface {
 	Update(ctx context.Context, f func(tx RwTx) error) error
 	UpdateNosync(ctx context.Context, f func(tx RwTx) error) error
 
+	// BeginRw - creates transaction
+	// 	tx may be discarded by .Rollback() method
+	//
+	// A transaction and its cursors must only be used by a single
+	// 	thread (not goroutine), and a thread may only have a single transaction at a time.
+	//  It happen automatically by - because this method calls runtime.LockOSThread() inside (Rollback/Commit releases it)
+	//  By this reason application code can't call runtime.UnlockOSThread() - it leads to undefined behavior.
+	//
+	// If this `parent` is non-NULL, the new transaction
+	//	will be a nested transaction, with the transaction indicated by parent
+	//	as its parent. Transactions may be nested to any level. A parent
+	//	transaction and its cursors may not issue any other operations than
+	//	Commit and Rollback while it has active child transactions.
 	BeginRw(ctx context.Context) (RwTx, error)
 	BeginRwNosync(ctx context.Context) (RwTx, error)
 }