fix oc api

Author: Nero-Hu

dita/RTC-NG/API/api_irtcengine_muterecordingsignal.dita

@@ -15,7 +15,7 @@
             <p outputclass="codeblock">
             <codeblock props="android" outputclass="language-java">public abstract int muteRecordingSignal(boolean muted);</codeblock>
             <codeblock props="hmos" outputclass="language-arkts"></codeblock>
-            <codeblock props="ios mac" outputclass="language-objectivec">-(int)muteRecordingSignal:(BOOL)muted;</codeblock>
+            <codeblock props="ios mac" outputclass="language-objectivec">- (int)muteRecordingSignal:(BOOL)muted;</codeblock>
             <codeblock props="cpp unreal" outputclass="language-cpp">virtual int muteRecordingSignal(bool mute) = 0;</codeblock>
             <codeblock props="bp" outputclass="language-cpp">UFUNCTION(BlueprintCallable, Category = &quot;Agora|IRtcEngine&quot;)
 	int MuteRecordingSignal(bool mute);</codeblock>

en-US/dita/RTC-NG/API/api_irtcengine_muterecordingsignal.dita

@@ -15,7 +15,7 @@
             <p outputclass="codeblock">
             <codeblock props="android" outputclass="language-java">public abstract int muteRecordingSignal(boolean muted);</codeblock>
             <codeblock props="hmos" outputclass="language-arkts"></codeblock>
-            <codeblock props="ios mac" outputclass="language-objectivec">-(int)muteRecordingSignal:(BOOL)muted;</codeblock>
+            <codeblock props="ios mac" outputclass="language-objectivec">- (int)muteRecordingSignal:(BOOL)muted;</codeblock>
             <codeblock props="cpp unreal" outputclass="language-cpp">virtual int muteRecordingSignal(bool mute) = 0;</codeblock>
             <codeblock props="bp" outputclass="language-cpp">UFUNCTION(BlueprintCallable, Category = &quot;Agora|IRtcEngine&quot;)
 	int MuteRecordingSignal(bool mute);</codeblock>