[all plugins] Improve documentation of configuration and usage

[rajgoel]

Please report any ambiguities and difficulties with the current documentation here.

[Ouch1978]

Hi @rajgoel

According to the README.md of Seminar plugin

It says:

Reveal.initialize({
  // ...
	seminar: {
		server: 'https://reveal-seminar.herokuapp.com', // change server as necessary
		room: 'Some room name', // put your room name here
		hash: '$2a$05$hhgakVn1DWBfgfSwMihABeYToIBEiQGJ.ONa.HWEiNGNI6mxFCy8S', // a hash is required for every seminar room and can be generated on the URL of the socket.io server
		autoJoin: true // set to true to auto,matically join the seminar room
	},
  // ...
	plugins: [ RevealChart, RevealSeminar, RevealChalkboard, RevealPoll, RevealQuestions  ]
	// check the respective documentation for the configurations of the other plugins
});

But according to the sample code.

It should be RevealQnA rather than RevealQuestions.

[rajgoel]

@Ouch1978 Thanks a lot, just fixed. Please also consider creating a new issue or pull request for obvious bugs in the future.