[MCKIN-8266] <span> and <i> Tags are being removed fixed in tinymce.

[LanghaniKuldeep]

In TinyMCE's html editor eliminates span and i tags on saving that. We are not able to use those tags, therefore, this PR extends valid tags and put them in the list.

[openedx-webhooks]

Thanks for the pull request, @LanghaniKuldeep! I've created OSPR-3771 to keep track of it in JIRA. JIRA is a place for product owners to prioritize feature reviews by the engineering development teams.

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[natabene]

@LanghaniKuldeep Thank you for the contribution! When you have a chance, could you please send in a signed Contributor Agreement mentioned in the earlier comment? You only need to do this once and we can then review all your future code contributions. Thanks
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[LanghaniKuldeep]

@natabene Thankyou for your comment. I am associated with Arbisoft. Can you assign someone from the team to review this PR?

[nedbat]

This seems like a fine change. 👍

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@LanghaniKuldeep 🎉 Your pull request was merged!

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[LanghaniKuldeep]

@natabene @nedbat Thanks for merging.
Can anyone of please create a new Release Tag for this fix so that I can use the updated one.