Just to pick a nit, that's not "WA perspective distortion" 'cuz it happens any time you point the camera up, regardless of the focal length. And the issue isn't how "straight" the lines are, but rather how much the presumptive vertical lines deviate from the true vertical.
The easiest way to fix it with a minimum of cropping is to use transform>skew in PS. You can accomplish the same thing with "distort" as Gina did, but it's easier for other distortions to creep in using that tool. Various editions of "perspective" correction tools work also (like the one Margaret chose) but you have to be aware that by default they correct both sides of the image symmetrically, so you need to take the top-center slider and pull it towards one edge or another to eliminate the distortion on the opposite edge, which is why "skew" is the tool of choice here: it works from one edge at a time.
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