Fix broken RSS feeds

[tunetheweb]

Changes proposed in this pull request:

• Fixes broken RSS feed for feedly. as reported by several users.

It looks like they don't accept type="text/html" anymore. The spec specifies we should be using "html" anyway. Doesn't look like we changed anything here, so maybe something changed at Feedly's end?

FYI, this was originally changed too text/html in #5873 but with no explanation why. D.C.C still uses "html"

Prod (and recent other staging URLs) has this on Feedly:

This branch's preview has this on Feedly:

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[tomayac]

The mode=escaped thing doesn't really seem defined. Maybe move to <![CDATA[…]]> now that you touch the code? Also: 3> for doing this in the first place.

[tunetheweb]

Agreed, but kinda keeping changes to a minimal for... well reasons I'm sure you understand :-)