Update barcodes.md

docs/user-documentation/general-users/barcodes.md

@@ -74,7 +74,9 @@ mobile device. The selection you make is saved.
 
 Updated on July 5, 2023
 
-## Printers
+## Printer and Barcode Scanner Requirements
+
+### Printers
 
 There are several manufacturers of printers and different kinds of
 barcodes and paper to adapt to different use cases. Most manufacturers
@@ -87,7 +89,7 @@ thus having as single requirement that the printer driver used allows to
 print PDF documents using applications such as Adobe Acrobat Reader or
 Preview (Mac).
 
-### Printer Configuration
+#### Printer Configuration
 
 There are different types of printer drivers. The two types we can
 define as generic are **PS** (PostScript) (recommended) and **PCL**
@@ -105,7 +107,7 @@ layouts are supported:
 The printer paper size needs to be configured for each printer. It is
 possible to indicate the size of the barcode, so it can fit.
 
-### Printer testing
+#### Printer testing
 
 We provide two example documents that can be used to test the printer.
 
@@ -121,28 +123,28 @@ barcodes may look squashed. In order to obtain optimal results, the
 paper size would need to be configured. However, for the test it is
 enough to verify that the printer can print those files.
 
-### Printer Advice before purchasing
+#### Printer Advice before purchasing
 
 Before purchasing a printer, we recommend to check with the manufacturer
 that the barcode printer provides a general driver and that it can print
 one of the documents provided as example above.
 
-### Tested Printers
+#### Tested Printers
 
 -   Zebra ZD420
 
-## Scanners
+### Scanners
 
 There are several manufacturers of barcode scanners. In most cases
 scanners act as a keyboard for the computer, so when the barcode scanner
 scans a barcode it will type whatever has been scanned.
 
-### Scanner Configuration
+#### Scanner Configuration
 
 The scanner keyboard layout should be the same as the computer used. If
 not this could cause problems if there are any special characters.
 
-### Scanner testing
+#### Scanner testing
 
 Open a notepad and scan the barcodes provided in the examples below. The
 scanner should read them and type the correct output.
@@ -160,13 +162,13 @@ scanner should read them and type the correct output.
     This should give as output “20210720122856003-454071” without
     quotes.
 
-### Scanner Advice before purchasing
+#### Scanner Advice before purchasing
 
 Before purchasing a scanner, ensure that the barcode scanner provides a
 keyboard driver and ask the manufacturer’s support to scan the examples
 above.
 
-### Tested Scanners
+#### Tested Scanners
 
 -   Honeywell 1902G-BF