[Typo] Node template naming in README is wrong

Hey there, 081622a added new Node.js templates to the README document, but they're are all named node14 instead of node16 and node17,

See:

templates/README.md

Lines 19 to 20 in d8893af

    
           | node14 | NodeJS | 16 | Alpine Linux | of-watchdog | [NodeJS template](https://github.com/openfaas/templates/tree/master/template/node16) 
        
           | node14 | NodeJS | 17 | Alpine Linux | of-watchdog | [NodeJS template](https://github.com/openfaas/templates/tree/master/template/node17)

I was about to create a pull request, but the contributing guide told me not to, so here's the issue. 😃

@cactysman feel free to send the PR

	\| node14 \| NodeJS \| 16 \| Alpine Linux \| of-watchdog \| [NodeJS template](https://github.com/openfaas/templates/tree/master/template/node16)
	\| node14 \| NodeJS \| 17 \| Alpine Linux \| of-watchdog \| [NodeJS template](https://github.com/openfaas/templates/tree/master/template/node17)