changes to docs/user-guide/context.md

[juggledad]

expanded the explainations about context and added some examples.

[knolleary]

Hi,

thanks for this - sorry it took a while to get back here.

Your proposed changes, along with other conversations that have been had in the forum, have certainly helped identify some areas where the context docs were lacking.

I've pushed my only version of the changes that I think incorporates the feedback. I'd appreciate your thoughts if this covers the topic better or if more is needed:

The change is here: 869cc97

You can, of course, see it live here: https://nodered.org/docs/user-guide/context

[juggledad]

Hi Nick, I just reread it and it looks fine to me and no worries on the time - I know you are always busy and you do a wonderful job!