Documentation could be more newbie-friendly

But the documentation could use a bit more examples for people who are new to CI 4 (and new to PHP 7 and namespaces, if I'm honest).
For example, when I tried to configure the encryption key for the Encryption Library, it took me a while to understand that where it said :

PHP Code:

// $key will be assigned a 32-byte (256-bit) random key
$key = Encryption::createKey(); 


it should actually have said :

PHP Code:

// $key will be assigned a 32-byte (256-bit) random key
$key = \CodeIgniter\Encryption\Encryption::createKey(); 


When I did what the documentation said, I got an error saying PHP couldn't find the Encryption class. It only worked when I fully typed out the namespaced class name.
So in the strictest sense, the documentation is wrong, or at least incomplete.

Yes, you are correct. I will fix it.

I send PR.
https://github.com/codeigniter4/CodeIgniter4/pull/4320

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The above is just one example of several situations I've encountered so far, where I needed to do some guessing and trial-and-error to get the (incomplete) examples in the documentations to actually work.

If you know another place where has code that does not work,
feel free to point it out.

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