Add web SDK note to OTT documentation

[spvismaya]

Pull Request/Issue Resolution

Description of Change:

Adding a note to OTT documentation that using CDN version of web sdk is preferred (and reason why)

Closes #ISSUE_NUMBER_HERE

Is this change associated with a Braze feature/product release?

• Yes (Insert Feature Release Date Here)
• No

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[spvismaya]

@cla-bot check

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The cla-bot has been summoned, and re-checked this pull request!

[davidbielik]

thanks!