Adjusts the link for the Observability board in the Infrastructue section of the handbook.
Why is this change being made?
Closes gitlab-com/gl-infra/infrastructure#7688. Fixes links and Markdown formatting for the section related to Observability work in the Site Reliability section of the handbook.
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what