Fix typo mistake in mediaGallery spelling

[majiddev10]

Fix typo mistake in mediaGallery spelling in Magento\CatalogImportExport\Model\Export\Product.php file

Description (*)

There is file name Product.php at path Magento\CatalogImportExport\Model\Export\Product has typo mistake in 6 places.
I also checked that this key is not used anywhere other than this file.

Fixed Issues (if relevant)

Manual testing scenarios (*)

1. open file Magento\CatalogImportExport\Model\Expor\Product.php
2. See there is mediaGalery written at 6 places instead of mediaGallery

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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