Clarify that each `platform` entry is a 1:1 mapping to output `charm` files
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### What needs to get done
Clarify in the charmcraft.yaml schema that each entry in `platforms` will result in a separate `charm` file on packing.
### Why it needs to get done
We got some questions/confusion about platforms - we should note that each entry specifically becomes its own `charm` file.
https://matrix.to/#/!LhFxJIPEcCacgdMghH:ubuntu.com/$XzGzD_5XLPXzfN2VqSMuoj4-t4C5MH-2nxv7Fh9ZRsY
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