docs: GitLab uses group milestones to handle issues
What does this MR do?
Change link from project milestones page to group milestone page, because GitLab is using group milestones to handle issues.
https://docs.gitlab.com/ee/development/contributing/issue_workflow.html
Author's checklist
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Apply the correct labels and milestone -
Crosslink the document from the higher-level index -
Crosslink the document from other subject-related docs -
Feature moving tiers? Make sure the change is also reflected in features.yml -
Correctly apply the product badges and tiers -
Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-checkjob fails
Review checklist
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Your team's review (required) -
PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards