Fix a typo

[ismailarilik]

memoized -> memorized

[zoffixznet]

I sent you an invite to *perl6 GitHub org. You can accept it here: https://github.com/perl6/

That gives you a commit bit to most of our repos, including this one, so once you accept the invite you can reject this PR yourself.

[zoffixznet]

or rather reject this PR and instead commit a change to make memoized (which is a proper word) to a link that explains what it is: https://en.wikipedia.org/wiki/Memoization 😸

[ismailarilik]

or rather reject this PR and instead commit a change to make memoized (which is a proper word) to a link that explains what it is: https://en.wikipedia.org/wiki/Memoization 😸

It is not necessary since this document doesn't seem to target newbies and all experts should know this term. =) I am closing the PR.