delete agora and add unity props

Author: Suri539

dita/RTC-NG/API/rtc_api_overview_ng.dita

@@ -659,7 +659,7 @@
             <strow props="rn flutter unity">
                 <stentry><xref keyref="enableRemoteSuperResolution"/></stentry>
                 <stentry><ph conkeyref="enableRemoteSuperResolution/shortdesc"/><ph props="cpp rn flutter unity">（仅适用于 Android 和 iOS）</ph></stentry>
-            </strow> 
+            </strow>
             <strow>
                 <stentry><xref keyref="setColorEnhanceOptions"/></stentry>
                 <stentry><ph conkeyref="setColorEnhanceOptions/shortdesc"/></stentry>
@@ -1034,7 +1034,7 @@
                 <stentry>方法</stentry>
                 <stentry>描述</stentry>
             </sthead>
-            <strow props="flutter rn electron">
+            <strow props="flutter rn electron unity">
                 <stentry><xref keyref="startEchoTest2"/></stentry>
                 <stentry><ph conkeyref="startEchoTest2/shortdesc"/></stentry>
             </strow>

dita/RTC-NG/RTC_NG_API_Unity.ditamap

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE map PUBLIC "-//OASIS//DTD DITA Map//EN" "map.dtd">
 <map>
-    <title>Agora Unity API Reference </title>
+    <title>Unity API Reference </title>
     <topicmeta>
         <navtitle>Unity API Reference</navtitle>
     </topicmeta>