Improve Session Management guide.

[mnmkng]

The session management guide shows how to set up SessionPool, but does not really tell the user how to use it for common use cases, like using a single IP until it breaks.

There's a mention about IP rotation in Proxy management, but it's not detailed enough.

[doaortu]

please do this. I don't know how to bring my own cookies to the crawlers session management.

Is it through createSessionFunction option? or I need to set the cookie at requestHandler each time?

[mnmkng]

@souravjain540 probably worth looking into with 11 upvotes