Process documentation isn't sorted alphabetically

[mureinik]

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.