Fix typo of Hander in interfaces_and_handler docs
Fix typo of Hander in interfaces_and_handler docs


Fixed a simple typo of the word 'Handler' (was 'Hander') inside of the 'interfaces_and_handler' documentation.
datafolklabs/cement,datafolklabs/cement,akhilman/cement,datafolklabs/cement,akhilman/cement,akhilman/cement