docs: replace LocalUtxo to LocalOutput

[15IITian]

All Submissions:

• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

fixes #1249

[notmandatory]

@Ademan is this what you had in mind for #1249 ? If so It's a very small and non-functional change and I'd prefer it be done as basic house keeping in some other more substantial PR.

[15IITian]

It's a very small and non-functional change and I'd prefer it be done as basic house keeping in some other more substantial PR.

If so we should close it .

[notmandatory]

Yes I'll close this PR and someone can fix it as housekeeping in another PR.