Update VersionDataFetcher KDoc

app/src/main/java/org/thoughtcrime/securesms/util/VersionDataFetcher.kt

@@ -41,10 +41,10 @@ class VersionDataFetcher @Inject constructor(
     private val scope = CoroutineScope(Dispatchers.Default)
 
     /**
-     * Schedules fetching version data [delayMillis] milliseconds from now.
+     * Schedules fetching version data.
      *
-     * This method will fetch immediately if 4 hours or more has elapsed since the last successful
-     * check.
+     * @param delayMillis The delay before fetching version data. Default value is 4 hours from the
+     * last check or 0 if there was no previous check or if it was longer than 4 hours ago.
      */
     @JvmOverloads
     fun startTimedVersionCheck(

libsession/src/main/java/org/session/libsession/messaging/file_server/FileServerApi.kt

@@ -131,10 +131,7 @@ object FileServerApi {
         val signature = BlindKeyAPI.blindVersionSign(secretKey, timestamp)
 
         // The hex encoded version-blinded public key with a 07 prefix
-        val blindedPkHex = buildString {
-            append("07")
-            append(blindedKeys.pubKey.toHexString())
-        }
+        val blindedPkHex = "07" + blindedKeys.pubKey.toHexString()
 
         val request = Request(
             verb = HTTP.Verb.GET,