Proposing a PR to fix a few small typos

[timgates42]

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine test/test_gpuarray.py and observe substraction, however expect to see subtraction.
• Examine pycuda/cuda/pycuda-helpers.hpp and observe supprt, however expect to see support.
• Examine examples/from-wiki/mandelbrot_interactive.py and observe rigth, however expect to see right.
• Examine aksetup_helper.py and observe prefered, however expect to see preferred.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR. Alternatively if the fix is undesired please
close the issue with a small comment about the reasoning.

https://github.com/timgates42/pycuda/pull/new/bugfix_typos

Thanks.

[inducer]

Sure, go ahead and make the PR.

[timgates42]

Thanks @inducer added #295