Correct spelling in the user section

The following pages had spelling errors, or code that was not
wrapped in inline code tags, which triggered spelling errors:

- doc/user/project/integrations/prometheus_library/cloudwatch.md
- doc/user/project/issues/csv_export.md
- doc/user/project/merge_requests/creating_merge_requests.md
- doc/user/project/merge_requests/merge_when_pipeline_succeeds.md
- doc/user/project/repository/forking_workflow.md
- doc/user/project/web_ide/index.md
- doc/user/project/clusters/serverless/aws.md