It’s easy to forget among the noise of toxicity, cultural division, polarized memes, and bad blood, that the people bringing us 24/7 news are just that, people. The new CNN Films documentary “On The Trail: Inside The 2020 Primaries” silences the rhetoric to reveal what it really takes for lead political reporters to deliver stories. Set against the 2020 primaries, the account of major female figures at the network also shows the unseen toll on personal lives.