MERGE IN 2.3.2: Fixed grammar

[mage2pratik]

This PR is a:

• New topic
• Content update
• Content fix or rewrite
• Bug fix or improvement

Summary

When this pull request is merged, it will fix grammar.

Additional information

Codebase:

1. https://github.com/magento/magento2/blob/75cf82651deefef6c38b052ce40e771475607d7c/app/code/Magento/Backend/etc/adminhtml/system.xml#L115
2. https://github.com/magento/magento2/blob/75cf82651deefef6c38b052ce40e771475607d7c/app/code/Magento/Backend/etc/adminhtml/system.xml#L119

List all affected URLs

• https://devdocs.magento.com/guides/v2.3/config-guide/prod/config-reference-most.html
• https://devdocs.magento.com/guides/v2.2/config-guide/prod/config-reference-most.html

[magento-cicd2]

An admin must run tests on this PR before it can be merged.

[keharper]

The field label changes were made in this PR: magento/magento2#21431

We can't work on it now, because the changes were merged for 2.3.2.

[erikmarr]

The screenshot in this topic will also need to be updated:
https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/themes/debug-theme.html

[Internal note] We'll need to update merchant docs as well:
https://docs.magento.com/m2/ce/user_guide/system/template-path-hints.html
https://docs.magento.com/m2/ce/user_guide/configuration/advanced/developer.html

[keharper]

running tests

[ghost]

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