Update JavaScriptContextHolder documentation to not mention CatlaystInstance (#50163)

Summary:
Pull Request resolved: #50163

Update JavaScriptContextHolder documentation to not mention CatlaystInstance

changelog: [internal] internal

Reviewed By: NickGerleman

Differential Revision: D71508657

fbshipit-source-id: 379be65c8a4afdfb0ed994fd1189b1285c246eec

Author: mdvacca

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/JavaScriptContextHolder.kt

@@ -10,9 +10,10 @@ package com.facebook.react.bridge
 import androidx.annotation.GuardedBy
 
 /**
- * Wrapper for JavaScriptContext native pointer. CatalystInstanceImpl creates this on demand, and
- * will call clear() before destroying the VM. People who need the raw JavaScriptContext pointer can
- * synchronize on this wrapper object to guarantee that it will not be destroyed.
+ * Wrapper for JavaScriptContext native pointer. This object is creates on demand as part of the
+ * initialization of React native, and will call clear() before destroying the VM. People who need
+ * the raw JavaScriptContext pointer can synchronize on this wrapper object to guarantee that it
+ * will not be destroyed.
  */
 public class JavaScriptContextHolder
 public constructor(@field:GuardedBy("this") private var context: Long) {