docs(to-markdown): correct omitSections options case

[evanjo03]

The docs for the omitSections options for customElementsManifestToMarkdown were displaying the wrong casing.

These are the SECTIONS listed in lib/index.js:

const SECTIONS = {
  mainHeading: 'main-heading',
  superClass: 'super-class',
  fields: 'fields', 
  methods: 'methods',
  staticFields: 'static-fields',
  staticMethods: 'static-methods',
  slots: 'slots',
  events: 'events',
  attributes: 'attributes',
  cssProperties: 'css-properties',
  cssParts: 'css-parts',
  mixins: 'mixins'
}

The below fn in the same file parses the options passed in to see if they match the values of the above object, and so should also be kebab-case, not camelCase:

function getOmittedConfig(type, omittedOptions) {
  // target will either be the declarations options object or the sections options object, depending on `type`
  const target = type === 'decl' ? Object.assign({}, DECLARATIONS) : Object.assign({}, SECTIONS);

  // rewrite target object with boolean values for comparison in nodes array
  // true if not omitted, false if omitted.
  Object.keys(target).forEach((omitted) => target[omitted] = !omittedOptions.includes(target[omitted]));
  return target;
}

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[thepassle]

this was fixed in https://github.com/open-wc/custom-elements-manifest/pull/198