Fix spelling (preceeding=> preceding) (#1671)

Co-authored-by: Anton Kolesnyk <41349689+antkmsft@users.noreply.github.com>

eng/common/scripts/Submit-PullRequest.ps1

@@ -23,12 +23,12 @@ The body message for the pull request.
 The labels added to the PRs. Multple labels seperated by comma, e.g "bug, service"
 .PARAMETER UserReviewers
 User reviewers to request after opening the PR. Users should be a comma-
-separated list with no preceeding `@` symbol (e.g. "user1,usertwo,user3")
+separated list with no preceding `@` symbol (e.g. "user1,usertwo,user3")
 .PARAMETER TeamReviewers
 List of github teams to add as reviewers
 .PARAMETER Assignees
 Users to assign to the PR after opening. Users should be a comma-separated list
-with no preceeding `@` symbol (e.g. "user1,usertwo,user3")
+with no preceding `@` symbol (e.g. "user1,usertwo,user3")
 .PARAMETER CloseAfterOpenForTesting
 Close the PR after opening to save on CI resources and prevent alerts to code
 owners, assignees, requested reviewers, or others.