docs: Fix a few typos

[timgates42]

There are small typos in:

• docs/python_docs/python/tutorials/getting-started/crash-course/7-use-gpus.md
• docs/static_site/src/pages/api/cpp/docs/tutorials/multi_threaded_inference.md
• example/README.md

Fixes:

• Should read specifying rather than specifieing.
• Should read multi threaded rather than iultithreaded.
• Should read provisioning rather than provisionning.

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

[mxnet-bot]

Hey @timgates42 , Thanks for submitting the PR
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