Update with info that more files can be uploaded

Author: vishaangelova

manage-data/ingest/upload-data-files.md

@@ -44,7 +44,7 @@ You can upload files, analyze their fields and metrics, and import their data in
 
     1. Choose whether to create a new index to store your data or to upload it to an existing index.
     2. Enter a name for the new index or select an existing index from the dropdown.
-    3. Drag a file into the upload area or click **Select or drag and drop a file** to choose a file from your computer.
+    3. Drag one or more files into the upload area or click **Select or drag and drop a file** to choose files from your computer.
 
        The supported file formats are PDF, TXT, CSV, log files and NDJSON.
 
@@ -58,7 +58,7 @@ You can upload files, analyze their fields and metrics, and import their data in
 
     1. Choose whether to create a new index to store your data or to upload it to an existing index.
     2. Enter a name for the new index or select an existing index from the dropdown.
-    3. Drag a file into the upload area or click **Select or drag and drop a file** to choose a file from your computer.
+    3. Drag one or more files into the upload area or click **Select or drag and drop a file** to choose files from your computer.
 
        The supported file formats are PDF, TXT, CSV, log files and NDJSON.