Updates "Saving to a Database" example to distinguish content changes

[DougReeder]

Description
As written, the "Saving to a Database" examples save even when the editor content is unchanged. This is inefficient and often undesirable.

[changeset-bot]

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Latest commit: fb47b8d

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[dylans]

Looks fine to me, though it needs to match the prettier config (see the suggested changes)... even though I personally prefer semicolons also.

[dylans]

@DougReeder Please run prettier on this and then we can land this change, thanks.