Fix link to staging in feature flags guide
What does this MR do and why?
This merge request fixes a link to staging environment in the feature flags guide.
The link was accidentally updated from staging.gitlab.com
to about.staging.gitlab.com
in e37c5db9.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Ahmed Hemdan