Reconcile duplicate content on importing memberships

[seancolsen]

These two sections are very similar:

• https://docs.civicrm.org/user/en/latest/membership/manual-entry-of-memberships/#importing-memberships
• https://docs.civicrm.org/user/en/latest/common-workflows/importing-data-into-civicrm/#import-memberships

To resolve:

1. Choose one place for the content
2. Merge content from both sections into that place
3. Provide a link from the place where it was removed

[github-actions]

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