Add more words to spelling exceptions list

doc/.vale/gitlab/spelling-exceptions.txt

doc/development/rake_tasks.md

doc/development/routing.md

doc/development/service_measurement.md

doc/development/sidekiq_style_guide.md

doc/development/telemetry/usage_ping.md

doc/development/testing_guide/best_practices.md

doc/development/testing_guide/end_to_end/page_objects.md

...de/end_to_end/running_tests_that_require_special_setup.md

doc/development/testing_guide/end_to_end/style_guide.md

doc/development/testing_guide/flaky_tests.md

doc/development/testing_guide/review_apps.md

doc/development/understanding_explain_plans.md

doc/development/uploads.md

doc/development/utilities.md

doc/development/windows.md

doc/user/project/clusters/serverless/index.md

doc/user/project/import/svn.md

doc/user/project/integrations/webex_teams.md

doc/user/project/issues/design_management.md