chore: fix typos in GitHub Actions workflow files

- Fix job name typo `asses-issue` → `assess-issue` in welcome-issue.yml
- Remove extra whitespace in workflow name in welcome-issue.yml
- Fix misleading step name "Auto-assign issue" → "Auto-assign pull
  request" in welcome-pr.yml

Author: VikrantSingh01

.github/workflows/welcome-issue.yml

@@ -1,4 +1,4 @@
-name:  Welcome to the Microsoft Generative AI
+name: Welcome to the Microsoft Generative AI
 on:
   # Trigger the workflow on new issue
   issues:
@@ -7,7 +7,7 @@ permissions:
   contents: read
   issues: write
 jobs:
-  asses-issue:
+  assess-issue:
     runs-on: ubuntu-latest
     steps:
       - name: Add Label and thanks comment to Issue

.github/workflows/welcome-pr.yml

@@ -27,7 +27,7 @@ jobs:
               repo: context.repo.repo,
               body: `👋 Thanks for contributing @${ issueAuthor }! We will review the pull request and get back to you soon.`
             })
-      - name: Auto-assign issue
+      - name: Auto-assign pull request
         uses: pozil/auto-assign-issue@v2
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}