process.env doc insufficient

[allan-bonadio]

process.env, in the nodejs process page, just tells us to see man 7 environ. Unfortunately that says:

 An array of strings called the environment is made available by execve(2) when a process begins.  By convention these strings have
 the form ``name=value''.  ....

yes, this is the world of old C/Unix; the env is always stored as an array rather than a dictionary (which wasn't easy in those days). with the rule that keys could not contain = characters cuz we all had to parse each string ourselves.

process.env, however, is correctly a dictionary (object). This should be explained. Also, can I write to it by just setting a field? node-inspector lets me do that but that should also be mentioned. You could do both with a simple example like process.env.LANG = 'en_US'

[mmalecki]

@allan-bonadio I added some docs in #6496, what do you think?

[bradisbell]

Can @mmalecki 's pull be merged in? If it isn't going to be merged (see the pull comments), please reject it and I'll take a crack at it. The doc is not useful in its current state.

[allan-bonadio]

This looks great, thanks!