[PR-26010] Update qr_code filter doc

Author: Doimhneacht

source/campaigns/editor/filters.rst

@@ -996,7 +996,8 @@ This example can be used in ``Email sending condition`` of Advocate Offer Email
 qr\_code
 ........
 
-Converts a string into a QR code image in SVG format.
+Converts a string into a QR code. By default, produces an image in SVG format. If HTML format is specified,
+returns an HTML table, which may be useful for inclusion in emails.
 
 .. code-block:: liquid
 
@@ -1007,6 +1008,7 @@ Converts a string into a QR code image in SVG format.
 It may take the following arguments:
 
 * ``xdim`` - the width of the narrowest bar in a barcode. Thicker bars are multiples of the xdim. Default value is ``4``.
+* ``format`` - custom format for the result. Only ``html`` is supported.
 
 This filter generates a QR code that can be used to encode URLs, text, or coupon codes. The QR code is returned as an SVG image that can be directly embedded in HTML.
 
@@ -1018,6 +1020,14 @@ This filter generates a QR code that can be used to encode URLs, text, or coupon
      {{ coupon.code | qr_code: xdim: 6 }}
    </div>
 
+To return a QR code as an HTML table that can be embedded in email body, use the custom format:
+
+.. code-block:: liquid
+
+   <div class="qr-code-container">
+     {{ coupon.code | qr_code: format: 'html' }}
+   </div>
+
 |hr|
 
 rand\_by