fix 404 url for sitemap content url

[sunilit42]

Fixed Issues (if relevant)
#23706

Solution:- As per google sitemap doc only three types of additional media types images, news, and video so the need of content tag. (More info: - https://support.google.com/webmasters/answer/183668?hl=en)
4

Preconditions (*)
1.Magento2.2.2 install

Steps to reproduce (*)
Go to:
1.Dashboard->Marketing->SEO & Search->sitemap
2.Click add new fill in required fields
3. hit save & generate
4.Open newly created xml and check urlset tag attr xmlns:content is: "http://www.google.com/schemas/sitemap-content/1.0"

Expected result (*)
Should be one of returns 200 OK like: http://www.sitemaps.org/schemas/sitemap/0.9

Actual result (*)
http://www.google.com/schemas/sitemap-content/1.0
ref:
Screenshot 2019-07-15 at 14 13 36

More Info: File https://github.com/magento/magento2/blob/2.2/app/code/Magento/Sitemap/Model/Sitemap.php#L324

Thanks.

[m2-assistant]

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[sunilit42]

Hey @orlangur

Any update here?

[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-5632 has been created to process this Pull Request
✳️ @sidolov, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

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[m2-assistant]

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