docs: add loading data from Firestore backup sample#737

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gcf-merge-on-green[bot] merged 8 commits intogoogleapis:masterfrom

tswast:DATASTORE_BACKUP-sample

Jul 16, 2021

Commits on Jul 2, 2021

feat: add LoadJobConfig.projection_fields to select DATASTORE_BACKUP fields
tswast
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docs: add loading data from Firestore backup sample
tswast
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Commits on Jul 14, 2021

Commits on Jul 15, 2021

Commits on Jul 16, 2021

remove unnecessary random_table
tswast
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