update readmes

WebApp/src/commonMain/kotlin/CustomEmojiIdToSet.kt

@@ -1,3 +1,4 @@
 import dev.inmo.tgbotapi.types.CustomEmojiId
 
+/** Fixed sample custom emoji used by both the Web App and its bot-assisted route. */
 val CustomEmojiIdToSet = CustomEmojiId("5424939566278649034")

WebApp/src/commonMain/kotlin/PreparedSampleData.kt

@@ -3,4 +3,5 @@ import dev.inmo.tgbotapi.types.request.RequestId
 import kotlin.random.Random
 import kotlin.random.nextUInt
 
+/** Process-local request ID used when the bot saves its sample managed-bot button. */
 val preparedSampleKeyboardRequestId = RequestId(Random.nextUInt().toUShort())

WebApp/src/commonMain/kotlin/WebAppDataWrapper.kt

@@ -1,5 +1,11 @@
 import kotlinx.serialization.Serializable
 
+/**
+ * JSON body used by server routes that validate Telegram Web App initialization.
+ *
+ * @property data raw `initData` received by the browser Web App.
+ * @property hash hash exposed by the parsed, unsafe initialization data.
+ */
 @Serializable
 data class WebAppDataWrapper(
     val data: String,