Update doc: url reference to grafana
What does this MR do?
Update references of old grafana url to new one.
The public url https://dashboards.gitlab.com
seems not working currently, but was mentioned in https://gitlab.slack.com/archives/C101F3796/p1535972420000100?thread_ts=1535495593.000200&cid=C101F3796
Related issues
https://gitlab.com/gitlab-com/infrastructure/issues/4815
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 -
Correctly apply the product badges and tiers -
Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-check
job 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