Unclear `Promise` types in `Clipboard.md`

Promises have to be for/of some type (that type can be `void`). This type should be explicityly mentioned (e.g., `Promise`, `Promise`, etc.)

- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L19-L23
- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L37-L41
- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L50-L53
- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L69-L72
- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L88-L91
- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L102-L105
- https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Clipboard.md?plain=1#L116-L120

_Originally posted by @pklaschka in https://github.com/AdobeDocs/uxp/pull/61#discussion_r997095368_

Open src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md and inspect the Promise return types at the linked lines. Determine the appropriate explicit type for each documented method, then update all seven references and review the rendered Markdown for consistent signatures.

Written by the indexing model from the issue text.