docs: fix documentation comments (redis#3351)

Author: StephQuery

command.go

@@ -4692,7 +4692,8 @@ func (cmd *MapStringStringSliceCmd) Clone() Cmder {
 }
 
 // -----------------------------------------------------------------------
-// MapStringInterfaceCmd represents a command that returns a map of strings to interface{}.
+
+// MapMapStringInterfaceCmd represents a command that returns a map of strings to interface{}.
 type MapMapStringInterfaceCmd struct {
 	baseCmd
 	val map[string]interface{}

commands.go

@@ -330,7 +330,7 @@ func (info LibraryInfo) Validate() error {
 	return nil
 }
 
-// Hello Set the resp protocol used.
+// Hello sets the resp protocol used.
 func (c statefulCmdable) Hello(ctx context.Context,
 	ver int, username, password, clientName string,
 ) *MapStringInterfaceCmd {

hash_commands.go

@@ -480,7 +480,7 @@ func (c cmdable) HGetEX(ctx context.Context, key string, fields ...string) *Stri
 	return cmd
 }
 
-// ExpirationType represents an expiration option for the HGETEX command.
+// HGetEXExpirationType represents an expiration option for the HGETEX command.
 type HGetEXExpirationType string
 
 const (