chore(datastore): Update comment to reflect breaking change

[royjit]

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #989 (811b368) into main (7194840) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #989      +/-   ##
==========================================
+ Coverage   54.92%   54.94%   +0.02%     
==========================================
  Files         634      634              
  Lines       18372    18372              
==========================================
+ Hits        10090    10094       +4     
+ Misses       8282     8278       -4     

Flag	Coverage Δ
API_plugin_unit_test	48.09% <ø> (+0.12%)	⬆️
AWSPluginsCore	72.41% <ø> (ø)
Amplify	45.81% <ø> (+0.04%)	⬆️
Analytics_plugin_unit_test	73.23% <ø> (ø)
Auth_plugin_unit_test	68.48% <ø> (ø)
DataStore_plugin_unit_test	71.02% <ø> (ø)
Predictions_plugin_unit_test	33.48% <ø> (ø)
Storage_plugin_unit_test	57.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...Categories/DataStore/Model/Internal/Embedded.swift	0.00% <ø> (ø)
...egories/DataStore/Model/Internal/Model+Array.swift	0.00% <ø> (ø)
...ories/DataStore/Model/Internal/Model+Codable.swift	51.72% <ø> (ø)
...ataStore/Model/Internal/Model+DateFormatting.swift	70.00% <ø> (ø)
...ies/DataStore/Model/Internal/Model+Subscript.swift	73.33% <ø> (ø)
...aStore/Model/Internal/ModelRegistry+Syncable.swift	0.00% <ø> (ø)
...egories/DataStore/Model/Internal/Persistable.swift	0.00% <ø> (ø)
...DataStore/Model/Internal/Schema/Model+Schema.swift	27.77% <ø> (ø)
...Model/Internal/Schema/ModelField+Association.swift	41.30% <ø> (ø)
...re/Model/Internal/Schema/ModelValueConverter.swift	0.00% <ø> (ø)
... and 3 more

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