Fix typos in godoc (#376)

config.go

@@ -206,7 +206,7 @@ type Config struct {
 
 	// NoSnapshotRestoreOnStart controls if raft will restore a snapshot to the
 	// FSM on start. This is useful if your FSM recovers from other mechanisms
-	// than raft snapshotting. Snapshot metadata will still be used to initalize
+	// than raft snapshotting. Snapshot metadata will still be used to initialize
 	// raft's configuration and index values. This is used in NewRaft and
 	// RestoreCluster.
 	NoSnapshotRestoreOnStart bool

discard_snapshot.go

@@ -42,7 +42,7 @@ func (d *DiscardSnapshotStore) Open(id string) (*SnapshotMeta, io.ReadCloser, er
 	return nil, nil, fmt.Errorf("open is not supported")
 }
 
-// Write returns successfully with the lenght of the input byte slice
+// Write returns successfully with the length of the input byte slice
 // to satisfy the WriteCloser interface
 func (d *DiscardSnapshotSink) Write(b []byte) (int, error) {
 	return len(b), nil

util.go

@@ -13,7 +13,7 @@ import (
 )
 
 func init() {
-	// Ensure we use a high-entropy seed for the psuedo-random generator
+	// Ensure we use a high-entropy seed for the pseudo-random generator
 	rand.Seed(newSeed())
 }