Update REST API documentation link
Update class-wc-frontend-scripts.php

See also https://github.com/bassjobsen/wp-defer-loading/issues/14 prettyPhoto-init is not only dependent of jquery, but also of prettyPhoto. The dependency of prettyPhoto is not set.
removed wc_clean/sanitize_text_field not needed. handled by wp core functions fixes #5318
added method to stop save duplicate sku in quick edit
fixed coding standards in includes/admin/post-types/class-wc-admin-cpt-product.php
Removes unused block and var.

There's duplicate block that does the same thing, but assigning to different variable.
On the end only the last variable is used, which is `$username`.
Update class-wc-emails.php

Check for a value against each meta item before outputting.
Typo fix.
fixed my account downloadables out of order
fixed incorrect order received endpoit tooltip
Clear cached API reports when deleting shop order transients
Change label and add description Closes #4698
Reverse calculator check Closes #5323
URL decode when viewing order attributes to prevent taxonomies not being found

Closes #5315
If billing email is not set and user ID is set, use email

Fixes #5356
Change the way order review data is appended to checkout to reduce likelihood of error

Fixes #5332
typecast $used_by to array in case its not set. Closes #5350
Check has_file when sending order emails for downloadables

Fixes #5296
Allow saving no downloads, if unset

#5296
Let get_file get the first file if no ID is defined

#5296