Update README.md

doc/ci/yaml/README.md

@@ -1721,7 +1721,7 @@ This example creates three paths of execution:
 1. If `needs:` is set to point to a job that is not instantiated
    because of `only/except` rules or otherwise does not exist, the
    job will fail.
-1. Note that one day one of the launch, we are temporarily limiting the 
+1. Note that on day one of the launch, we are temporarily limiting the 
    maximum number of jobs that a single job can need in the `needs:` array. Track
    our [infrastructure issue](https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/7541)
    for details on the current limit.