refactor: fix typo (planning#1151)

client/src/main/java/dev/fitko/fitconnect/core/io/FileChunker.java

@@ -121,7 +121,7 @@ public class FileChunker {
      * @param data       as byte[] that should be written
      * @param chunkIndex index of the current chunk that is used in the filename
      * @param outputDir  the target path dir the chunk is written to
-     * @return that file tha was written
+     * @return that file that was written
      * @throws IOException if there was an error whilst writing the file
      */
     public File writeFileChunk(final byte[] data, final int chunkIndex, final Path outputDir) throws IOException {