Process documentation isn't sorted alphabetically

### Affected URL(s)

https://nodejs.org/api/process.html

### Description of the problem

The Node.js documentation is, for the most part, sorted alphabetically (or, at least, within every conceptual section, it's sorted alphabetically). 

The `process` API documentation more-or-less follows this rule, with two methods being out of place - `availableMemory` and `execve`.