Add TippyFlitsUK as "write access" to filecoin-docs

[BigLep]

Why do you need this?

@TippyFlitsUK is often involved in SP documentation and now FOC documentation. At the minimum he should have triage access.

Reviewer's Checklist

• It is clear where the request is coming from (if unsure, ask)
• All the automated checks passed
• The YAML changes reflect the summary of the request
• The Terraform plan posted as a comment reflects the summary of the request

[github-actions]

The following access changes will be introduced as a result of applying the plan:

Access Changes

User tippyflitsuk:
  - will gain push permission to filecoin-docs

[github-actions]

Before merge, verify that all the following plans are correct. They will be applied as-is after the merge.

Terraform plans

filecoin-project

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # github_repository_collaborator.this["filecoin-docs:tippyflitsuk"] will be created
  + resource "github_repository_collaborator" "this" {
      + id                          = (known after apply)
      + invitation_id               = (known after apply)
      + permission                  = "push"
      + permission_diff_suppression = false
      + repository                  = "filecoin-docs"
      + username                    = "TippyFlitsUK"
    }

Plan: 1 to add, 0 to change, 0 to destroy.