API_GUIDE.md: fix execution => exception typo + rewording #7808
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Fix a typo ("The only execution is with PJRT runtime on TPU v2 and TPU v3..." => "The only exception is with PJRT runtime on TPU v2 and TPU v3...") that can be confusing if you're not already familiar with how processes and threads are handled.
I also rephrased the rest of the section to try to make it easier to understand.