Update NOTES.txt

Author: akshatsinha007

charts/devtron/templates/NOTES.txt

@@ -2,7 +2,7 @@
     {{- $liveCm := lookup "v1" "ConfigMap" "devtroncd" "devtron-custom-cm" }}
     {{- $currentValue := pluck "POSTGRES_MIGRATED" $liveCm.data | first | default "" }}
     {{- if ne $currentValue "14" }}
-      {{- fail "Upgrade Failed Please ensure that you have completed the pre-requisites mentioned in <filelink>" }}
+      {{- fail "Upgrade Failed Please ensure that you have completed the pre-requisites mentioned in https://docs.devtron.ai/upgrade/devtron-upgrade-1.5.0" }}
     {{- end }}
 {{- end }}