docs(shell): update example to include Encoding usage in Command::spawn

[Tunglies]

See context in issue #1471 and PR #3148

CC @Legend-Master

[github-actions]

Package Changes Through 50b3cb7

There are 27 changes which include dialog-js with minor, dialog with minor, log with minor, log-js with minor, localhost with patch, shell with patch, shell-js with patch, barcode-scanner with patch, barcode-scanner-js with patch, deep-link with patch, deep-link-js with patch, fs with patch, fs-js with patch, http with patch, http-js with patch, nfc with patch, nfc-js with patch, opener with patch, opener-js with patch, store with patch, store-js with patch, updater with minor, updater-js with minor, upload with minor, upload-js with minor, websocket with patch, websocket-js with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.38	2.0.39
api-example-js	2.0.34	2.0.35
deep-link-example-js	2.2.8	2.2.9
barcode-scanner	2.4.2	2.4.3
barcode-scanner-js	2.4.2	2.4.3
deep-link	2.4.5	2.4.6
deep-link-js	2.4.5	2.4.6
fs	2.4.4	2.4.5
fs-js	2.4.4	2.4.5
dialog	2.4.2	2.5.0
dialog-js	2.4.2	2.5.0
opener	2.5.2	2.5.3
opener-js	2.5.2	2.5.3
http	2.5.4	2.5.5
http-js	2.5.4	2.5.5
localhost	2.3.1	2.3.2
log	2.7.1	2.8.0
log-js	2.7.1	2.8.0
nfc	2.3.3	2.3.4
nfc-js	2.3.3	2.3.4
persisted-scope	2.3.4	2.3.5
shell	2.3.3	2.3.4
shell-js	2.3.3	2.3.4
single-instance	2.3.6	2.3.7
store	2.4.1	2.4.2
store-js	2.4.1	2.4.2
updater	2.9.0	2.10.0
updater-js	2.9.0	2.10.0
upload	2.3.2	2.4.0
upload-js	2.3.2	2.4.0
websocket	2.4.1	2.4.2
websocket-js	2.4.1	2.4.2

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[Tunglies]

Added on a new example block, should be better now.

[Legend-Master]

Also you may want to fix the indentation of the example 🙃

[Legend-Master]

Thanks