refactor: fix typo (planning#2251)

client/src/main/java/dev/fitko/fitconnect/api/domain/model/attachment/Attachment.java

@@ -200,7 +200,7 @@ public final class Attachment {
     }
 
     /**
-     * Creates an attachment for input-stream that <b>does not fit into memory</b> and will be stored as a file/path reference.
+     * Creates an attachment for an input-stream that <b>does not fit into memory</b> and will be stored as a file/path reference.
      * This type of attachment will be chunked automatically.
      *
      * @param inputStream stream of the attachment file