pr_3371.prdoc

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title: removed `pallet::getter` from example pallets

doc:
  - audience: Runtime Dev
    description: |
      This PR removes all the `pallet::getter` usages from the template pallets found in the Substrate and Cumulus template nodes, and from the Substrate example pallets.  
      The purpose is to discourage developers to use this macro, that is currently being removed and soon will be deprecated.

crates: 
  - name: pallet-template
  - name: pallet-parachain-template
  - name: pallet-example-basic
  - name: pallet-example-kitchensink
  - name: pallet-example-offchain-worker
  - name: pallet-example-split