chore: typo in pricing rule schema (#35457)

diff --git a/erpnext/accounts/doctype/pricing_rule/pricing_rule.json b/erpnext/accounts/doctype/pricing_rule/pricing_rule.json
index a63039e..e8e8044 100644
--- a/erpnext/accounts/doctype/pricing_rule/pricing_rule.json
+++ b/erpnext/accounts/doctype/pricing_rule/pricing_rule.json
@@ -469,7 +469,7 @@
    "options": "UOM"
   },
   {
-   "description": "If rate is zero them item will be treated as \"Free Item\"",
+   "description": "If rate is zero then item will be treated as \"Free Item\"",
    "fieldname": "free_item_rate",
    "fieldtype": "Currency",
    "label": "Free Item Rate"
@@ -670,4 +670,4 @@
  "sort_order": "DESC",
  "states": [],
  "title_field": "title"
-}
\ No newline at end of file
+}