Feedback for Content Security Policy (CSP) in DNN

The example CSP mistakenly contains the string "connect-src" as a source for the script-src directive.

The "connect-src" string should be removed from the source list for script-src directive.

Otherwise, to also add the connect-src directive, add ";" after "https://cdn.syndication.twimg.com", and also add a source to connect-src directive, such as 'self'.

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#### Document Details

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* Content Source: [content-security-policy](https://github.com/DNNCommunity/DNNDocs/blob/master/content/guides/tutorials/security/content-security-policy/index.md/#L1)