Fix a link to `Types` documentation in Writing templates.md
Fix a link to `Types` documentation in Writing templates.md

krzysztofzablocki/Sourcery,krzysztofzablocki/Sourcery,Antondomashnev/Sourcery,krzysztofzablocki/Sourcery,Antondomashnev/Sourcery,krzysztofzablocki/Sourcery,Antondomashnev/Sourcery,Antondomashnev/Sourcery,Antondomashnev/Sourcery