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Fix typo in lesson1: "process ID" -> "processor ID" #275

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Fix typo in lesson1: "process ID" -> "processor ID" #275

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2 changes: 1 addition & 1 deletion docs/lesson01/rpi-os.md
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Expand Up @@ -193,7 +193,7 @@ _start:
```

The first thing this function does is check the processor ID. The Raspberry Pi 3 has four core processors, and after the device is powered on, each core begins to execute the same code. However, we don't want to work with four cores; we want to work only with the first one and put all of the other cores in an endless loop. This is exactly what the `_start` function is responsible for. It gets the processor ID from the [mpidr_el1](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0500g/BABHBJCI.html) system register.
If the current process ID is 0, then execution is transferred to the `master` function:
If the current processor ID is 0, then execution is transferred to the `master` function:

```
master:
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