Fix JSDoc linting issues (#75)

* Update jsdoc annotation for wait parameter to accept boolean

* Fix eslint warning jsdoc/newline-after-description

Author: mattt

lib/collections.js

@@ -12,6 +12,7 @@ async function getCollection(collection_slug) {
 
 /**
  * Fetch a list of model collections
+ *
  * @returns {Promise<object>} - Resolves with the collections data
  */
 async function listCollections() {

lib/predictions.js

@@ -4,7 +4,7 @@
  * @param {object} options
  * @param {string} options.version - Required. The model version
  * @param {object} options.input - Required. An object with the model inputs
- * @param {object} [options.wait] - Whether to wait for the prediction to finish. Defaults to false
+ * @param {boolean|object} [options.wait] - Whether to wait for the prediction to finish. Defaults to false
  * @param {number} [options.wait.interval] - Polling interval in milliseconds. Defaults to 250
  * @param {number} [options.wait.maxAttempts] - Maximum number of polling attempts. Defaults to no limit
  * @param {string} [options.webhook] - An HTTPS URL for receiving a webhook when the prediction has new output