Fix #17579 Typo in Gallery.php

[Spaggel]

Description

This PR fixes a typo in Gallery.php, setMegiaGallery should be setMediaGallery.

Fixed issue

see #17579

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)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @Spaggel. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me {$VERSION} instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Assistant documentation

[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-2816 has been created to process this Pull Request

[magento-engcom-team]

@Spaggel thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[Spaggel]

@magento-engcom-team Done! Question: can you add me to the partner-guapa developer list so the partner-contribution labels get added? Thanks!

[sidolov]

Hi @Spaggel , please, contact engcom@magento.com with your corporate email and we will add your account to the team.
Thank you!

[Spaggel]

@sidolov I accidentally pushed another commit to the same branch, I was going to open a new PR for it.. how should we proceed?

[sidolov]

Hi @Spaggel , just reset to the first commit and force push the branch and we will proceed with current PR

[Spaggel]

@sidolov done

[magento-engcom-team]

Hi @Spaggel. Thank you for your contribution.
We will aim to release these changes as part of 2.3.0.
Please check the release notes for final confirmation.