Docs describe system column prefix `_sdc` but not `__sdc`

[pmocek]

Stitch documentation page DOCS > REPLICATION > LOADING > STITCH SYSTEM TABLE AND COLUMN REFERENCE states:

Stitch system columns are prepended with _sdc.

However, it appears to me that Stitch system columns are prepended with either _sdc or __sdc. For example, columns __sdc_primary_key and __sdc_row_number are prefixed not with _sdc but with __sdc.

This is rendered from line 47 of _replication/loading/system-tables/system-tables-and-columns.md:

Stitch system columns are prepended with `{{ system-column.prefix }}`.