It's all well & good to notice that the vertical lines are slightly converging at the edges of the image ( not at all objectionably in this shot by the way, in my opinion ), BUT, please bear in mind that this
is a good example of street photography, which by its very definition indicates that an image is a result of an opportunistic grabshot and precludes such niceties / luxuries as perspective control lenses, since the use of one requires a tripod, slowing things down unacceptably. On the other hand, if the photographer had stopped to carefully compose the image and align the image in the viewfinder ( i.e. where all the vertical lines in the above shot are truly vertical and parallel to each other without diverging or converging it would have meant that the subject 911 would have been placed differently in the image and would most likely have required extensive cropping resulting in a differently proportioned image which probably would have looked odd and contrived.
However, I suspect that you are most likely intimating a third option, straightening the converging verticals in Photoshop or the latest version of Lightroom, which would be in my view the absolutely last resort to try to correct such a flaw, if you can even call this example in need of "correction" since what you refer to "correct" verticals is a fundamental aspect of the element of composition that should be really addressed
before the shutter is fired. In fact, I'll go further and suggest that such minor imperfections constitute a large part of the charm of effective street photography.
At the risk of being accused of unsolicited editorializing, I submit that those who fancy themselves photographers need to be very clear in their minds and carefully follow a regimen of just what
can, and much more importantly,
should or
should not be enhanced, repaired, fixed, tweaked, reduced, magnified "electronically" via software manipulation without risking an overall downgrade in the all-important total image quality of the shot you're working on as opposed to changing the very "structure" of the shot. I submit that sometimes, a minor imperfection should be allowed to continue to remain a part of the original image ( after drawing a lesson from the alleged mistake for the next time you encounter it ) instead of adversely affecting the image via mouse and keyboard.
JZG