[Backport 2.x] Remove DCO config and update PR template link

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,4 +12,4 @@
 - [ ] Commits are signed as per the DCO using --signoff 
 
 By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
-For more information on following Developer Certificate of Origin and signing off your commits, please check [here](https://github.com/opensearch-project/k-NN/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).
+For more information on following Developer Certificate of Origin and signing off your commits, please check [here](https://github.com/opensearch-project/search-processor/blob/main/CONTRIBUTING.md).

.github/workflows/create-documentation-issue.yml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Edit the issue template
         run: |
-          echo "https://github.com/opensearch-project/k-NN/pull/${{ env.PR_NUMBER }}." >> ./.github/ISSUE_TEMPLATE/documentation-issue.md
+          echo "https://github.com/opensearch-project/search-processor/pull/${{ env.PR_NUMBER }}." >> ./.github/ISSUE_TEMPLATE/documentation-issue.md
 
       - name: Create Issue From File
         id: create-issue