Maintenance : Deprecate FCallRo & add FCallRO (redis#2550)

* Deprecated FCallRo

* feat: FCallRo to FCallRO

Signed-off-by: monkey92t <golang@88.com>

* update doc

Signed-off-by: monkey92t <golang@88.com>

---------

Signed-off-by: monkey92t <golang@88.com>
Co-authored-by: Anuragkillswitch <70265851+Anuragkillswitch@users.noreply.github.com>
Co-authored-by: monkey92t <golang@88.com>

Author: SoulPancake

commands.go

@@ -451,6 +451,7 @@ type Cmdable interface {
 	FunctionStats(ctx context.Context) *FunctionStatsCmd
 	FCall(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd
 	FCallRo(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd
+	FCallRO(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd
 
 	Publish(ctx context.Context, channel string, message interface{}) *IntCmd
 	SPublish(ctx context.Context, channel string, message interface{}) *IntCmd
@@ -3495,7 +3496,14 @@ func (c cmdable) FCall(ctx context.Context, function string, keys []string, args
 	_ = c(ctx, cmd)
 	return cmd
 }
+
+// FCallRo this function simply calls FCallRO,
+// Deprecated: to maintain convention FCallRO.
 func (c cmdable) FCallRo(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd {
+	return c.FCallRO(ctx, function, keys, args...)
+}
+
+func (c cmdable) FCallRO(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd {
 	cmdArgs := fcallArgs("fcall_ro", function, keys, args...)
 	cmd := NewCmd(ctx, cmdArgs...)
 	if len(keys) > 0 {