Missing type information in `Blob.md`

[pklaschka]

• https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Blob.md?plain=1#L10 (probably number)
• https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Blob.md?plain=1#L17
• parameter types in https://github.com/AdobeDocs/uxp/blob/47510097aaf62876dfe00a01e00461ce5018e6cc/src/pages/uxp/reference-js/Global%20Members/Data%20Transfers/Blob.md?plain=1#L32-L41

_Originally posted by @pklaschka in https://github.com/AdobeDocs/uxp/pull/61#discussion_r997092161_