Blocks: Remove require-jsdoc eslint rule

[ryelle]

Remove require-jsdoc from our eslint config. I've been disabling this per-file in #243 & #250, since adding valid jsdoc comments to components (and each method in each component) is more noise than benefit. These are usually overly-generic and the components are just as understandable without them. For example…

/**
 * Component for displaying the block content.
 */
class OrganizerList extends Component {

Sure, ^ this could be "Component to display the organizer list" but that's clear from the code. This doc for render is also not helpful, it's the render function in the edit component, of course it'll render editing UI.

	/**
	 * Render the block's editing UI.
	 *
	 * @return {Element}
	 */
	render() {

Since components can be functions, classes, or anonymous functions, I've just removed the rule entirely – we can trust a developer's best judgement for whether a function needs documentation, and the valid-jsdoc rule will still kick in to check the formatting.