Unclear Promise types in Clipboard.md

[pklaschka]

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

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 19 to 23 in 4751009

  	## setContent(data)
  	Set data to clipboard.
  	Note: This is a non-standard API.
  	**Returns**: `Promise`

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 37 to 41 in 4751009

  	## getContent()
  	Get data from clipboard.
  	Note: This is a non-standard API.
  	**Returns**: `Promise`

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 50 to 53 in 4751009

  	## write(text)
  	Write data to clipboard.This can be used to implement cut and copy functionality.
  	**Returns**: `Promise`

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 69 to 72 in 4751009

  	## writeText(text)
  	Write text to clipboard.This can be used to implement cut and copy text functionality.
  	**Returns**: `Promise`

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 88 to 91 in 4751009

  	## read()
  	Read data from clipboard.
  	**Returns**: `Promise`

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 102 to 105 in 4751009

  	## readText()
  	Read text from clipboard.
  	**Returns**: `Promise`

• uxp/src/pages/uxp/reference-js/Global Members/Data Transfers/Clipboard.md

  Lines 116 to 120 in 4751009

  	## clearContent()
  	Clear clipboard content.
  	Note: Nonstandard: This method is non-standard.
  	**Returns**: `Promise`

Originally posted by @pklaschka in #61 (comment)