DEVDOCS-6646 - Update store information metafields to use v3 api endpoint (#1174)

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# [DEVDOCS-6646]


## What changed?
* The Store Information Metafield endpoints docs were updated to use the
v3 api endpoint rather than v2

## Release notes draft
* The Store Information Metafield endpoints docs were updated to use the
v3 api endpoint rather than v2

ping @bigcommerce/dev-docs 


[DEVDOCS-6646]:
https://bigcommercecloud.atlassian.net/browse/DEVDOCS-6646?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: chris-nowicki