fix: Change validation message

grammatical fix
diff --git a/erpnext/stock/doctype/stock_settings/stock_settings.py b/erpnext/stock/doctype/stock_settings/stock_settings.py
index 4c7828b..3b9608b 100644
--- a/erpnext/stock/doctype/stock_settings/stock_settings.py
+++ b/erpnext/stock/doctype/stock_settings/stock_settings.py
@@ -55,7 +55,7 @@
 			""")
 
 			if sle:
-				frappe.throw(_("Can't change valuation method, as there are transactions against some items which does not have it's own valuation method"))
+				frappe.throw(_("Can't change the valuation method, as there are transactions against some items which do not have its own valuation method"))
 
 	def validate_clean_description_html(self):
 		if int(self.clean_description_html or 0) \