docs: fix incorrect identifier authorizationCodeRepository

[wxh06]

As far as I know, it has been authCodeRepository and AuthCodeGrant since 3.x

ts-oauth2-server/src/authorization_server.ts

Line 43 in 036e5e4

authCodeRepository: OAuthAuthCodeRepository;

ts-oauth2-server/src/grants/auth_code.grant.ts

Line 42 in 036e5e4

export class AuthCodeGrant extends AbstractAuthorizedGrant {

[wxh06]

I've gone through the entire commit history but haven't figured out how the identifier authorizationCodeRepository was introduced in the documentation :(

[jasonraimondi]

👏 Thank you for helping clean the docs up! Much appreciated.