Minor cleanup on the doc

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/Room.kt

@@ -83,7 +83,7 @@ interface Room :
      * @param beforeLimit how many events before the result are returned.
      * @param afterLimit how many events after the result are returned.
      * @param includeProfile requests that the server returns the historic profile information for the users that sent the events that were returned.
-     * @param callback Callback to get the search result
+     * @return The search result
      */
     suspend fun search(searchTerm: String,
                nextBatch: String?,

vector/src/main/java/im/vector/app/core/utils/ExternalApplicationsUtil.kt

@@ -509,7 +509,7 @@ fun selectTxtFileToWrite(
  * @param sourceFile     the file source path
  * @param dstDirPath     the dst path
  * @param outputFilename optional the output filename
- * @param callback       the asynchronous callback
+ * @return               the created file
  */
 @Suppress("DEPRECATION")
 fun saveFileIntoLegacy(sourceFile: File, dstDirPath: File, outputFilename: String?): File? {