update unity keys map and add a codeblock

Author: Suri539

dita/RTC-NG/API/api_imediaplayer_unregistervideoframeobserver.dita

@@ -19,7 +19,7 @@
             <codeblock props="electron" outputclass="language-typescript">abstract unregisterVideoFrameObserver(
     observer: IMediaPlayerVideoFrameObserver
   ): number;</codeblock>
-            <codeblock props="unity" outputclass="language-csharp">public abstract void UnregisterVideoFrameObserver(IAgoraRtcMediaPlayerVideoFrameObserver observer);</codeblock>
+            <codeblock props="unity" outputclass="language-csharp">public abstract int UnRegisterVideoFrameObserver();</codeblock>
             <codeblock props="rn" outputclass="language-typescript">abstract unregisterVideoFrameObserver(
     observer: IMediaPlayerVideoFrameObserver
   ): number;</codeblock>
@@ -31,10 +31,10 @@
             <parml>
             <plentry>
                 <pt>observer</pt>
-                <pd>视频帧观测器，观测每帧视频的接收，详见 <xref props="cpp" keyref="IVideoFrameObserver"/><xref props="electron rn flutter" keyref="IMediaPlayerVideoFrameObserver"/>。</pd>
+                <pd>视频帧观测器，观测每帧视频的接收，详见 <xref props="cpp unity" keyref="IVideoFrameObserver"/><xref props="electron rn flutter" keyref="IMediaPlayerVideoFrameObserver"/>。</pd>
             </plentry>
             </parml> </section>
-        <section id="return_values" props="cpp electron rn">
+        <section id="return_values" props="cpp electron rn unity">
             <title>返回值</title>
             <ul id="ul_uns_l2y_hqb">
             <li>0: 方法调用成功。</li>

dita/RTC-NG/RTC_NG_API_Unity.ditamap

@@ -105,7 +105,7 @@
             <topicref keyref="setSubscribeAudioAllowlistEx" toc="no"/>
             <topicref keyref="setSubscribeVideoBlocklistEx" toc="no"/>
             <topicref keyref="setSubscribeVideoAllowlistEx" toc="no"/>
-            <topicref keyref="setupRemoteVideoEx" toc="no" props="hide"/>
+            <topicref keyref="setupRemoteVideoEx" toc="no"/>
             <topicref keyref="setVideoEncoderConfigurationEx" toc="no"/>
             <topicref keyref="startChannelMediaRelayEx" toc="no"/>
             <topicref keyref="startRtmpStreamWithoutTranscodingEx" toc="no"/>
@@ -365,7 +365,7 @@
         <topicref href="API/toc_video_observer.dita" chunk="to-content">
             <topicref keyref="getObservedFramePosition" toc="no"/>
             <topicref keyref="getVideoFormatPreference" toc="no"/>
-            <topicref keyref="unregisterVideoFrameObserver_IMediaEngine" toc="no"/>
+            <topicref keyref="unregisterVideoFrameObserver_IMediaPlayer" toc="no"/>
             <topicref keyref="unregisterVideoEncodedFrameObserver" toc="no"/>
             <topicref keyref="onEncodedVideoFrameReceived" toc="no"/>
             <topicref keyref="registerVideoEncodedFrameObserver" toc="no"/>
@@ -437,7 +437,6 @@
             <topicref keyref="switchSrc" toc="no"/>
             <topicref keyref="unloadSrc" toc="no"/>
             <topicref keyref="unregisterAudioFrameObserver_IMediaPlayer" toc="no"/>
-            <topicref keyref="unregisterVideoFrameObserver_IMediaEngine" toc="no"/>
             <topicref keyref="onAudioVolumeIndication_IMediaPlayerSourceObserver" toc="no"/>
             <topicref keyref="onMetaData" toc="no"/>
             <topicref keyref="onPlayBufferUpdated" toc="no"/>

dita/RTC-NG/config/keys-rtc-ng-api-unity.ditamap

@@ -1343,7 +1343,7 @@
                     </keywords>
                 </topicmeta>
             </keydef>
-            <keydef keys="setupRemoteVideoEx" href="../API/api_irtcengineex_setupremotevideoex.dita" props="hide">
+            <keydef keys="setupRemoteVideoEx" href="../API/api_irtcengineex_setupremotevideoex.dita">
                 <topicmeta>
                     <keywords>
                         <keyword>SetupRemoteVideoEx</keyword>
@@ -2571,7 +2571,7 @@
                     </keywords>
                 </topicmeta>
             </keydef>
-            <keydef keys="unregisterVideoFrameObserver_IMediaEngine" href="../API/api_imediaengine_unregistervideoframeobserver.dita">
+            <keydef keys="unregisterVideoFrameObserver_IMediaPlayer" href="../API/api_imediaplayer_unregistervideoframeobserver.dita">
                 <topicmeta>
                     <keywords>
                         <keyword>UnregisterVideoFrameObserver</keyword>