Typo fixes, type fixes on the return clauses of the buyEthUrl and getPrefferedLangCode functions.

app/scripts/controllers/address-book.js

@@ -10,7 +10,7 @@ class AddressBookController {
    * addresses and all currently owned addresses.
    *
    * @typedef {Object} AddressBookController
-   * @param {object} opts Overides the defaults for the initial state of this.store
+   * @param {object} opts Overrides the defaults for the initial state of this.store
    * @property {array} opts.initState  initializes the the state of the AddressBookController. Can contain an
    * addressBook property to initialize the addressBook array
    * @param {KeyringController} keyringController (Soon to be deprecated) The keyringController used in the current

app/scripts/controllers/currency.js

@@ -10,7 +10,7 @@ class CurrencyController {
 	 * Controller responsible for managing data associated with the currently selected currency.
 	 *
    * @typedef {Object} CurrencyController
-	 * @param {object} opts Overides the defaults for the initial state of this.store
+	 * @param {object} opts Overrides the defaults for the initial state of this.store
 	 * @property {array} opts.initState  initializes the the state of the CurrencyController. Can contain an
    * currentCurrency, conversionRate and conversionDate properties
    * @property {string} currentCurrency A 2-4 character shorthand that describes a specific currency, currently

app/scripts/controllers/preferences.js

@@ -7,7 +7,7 @@ class PreferencesController {
 	/**
 	 *
    * @typedef {Object} PreferencesController
-	 * @param {object} opts Overides the defaults for the initial state of this.store
+	 * @param {object} opts Overrides the defaults for the initial state of this.store
    * @property {object} store The an object containing a users preferences, stored in local storage
 	 * @property {array} store.frequentRpcList A list of custom rpcs to provide the user
    * @property {string} store.currentAccountTab Indicates the selected tab in the ui

app/scripts/controllers/shapeshift.js

@@ -11,7 +11,7 @@ class ShapeshiftController {
      * that queries a shapeshift.io API for updates to any pending shapeshift transactions
      *
      * @typedef {Object} ShapeshiftController
-     * @param {object} opts Overides the defaults for the initial state of this.store
+     * @param {object} opts Overrides the defaults for the initial state of this.store
      * @property {array} opts.initState  initializes the the state of the ShapeshiftController. Can contain an
      * shapeShiftTxList array.
      * @property {array} shapeShiftTxList An array of ShapeShiftTx objects

app/scripts/lib/buy-eth-url.js

@@ -6,8 +6,9 @@ module.exports = getBuyEthUrl
  * @param {object} opts Options required to determine the correct url
  * @param {string} opts.network The network for which to return a url
  * @param {string} opts.amount The amount of ETH to buy on coinbase. Only relevant if network === '1'.
- * @param {string} opts.address The adderss the bought ETH should be sent to.  Only relevant if network === '1'.
+ * @param {string} opts.address The address the bought ETH should be sent to.  Only relevant if network === '1'.
- * @returns {string} The url at which the user can access ETH, while in the given network
+ * @returns {string|undefined} The url at which the user can access ETH, while in the given network. If the passed
+ * network does not match any of the specified cases, or if no network is given, returns undefined.
  *
  */
 function getBuyEthUrl ({ network, amount, address }) {

app/scripts/lib/nodeify.js

@@ -3,7 +3,7 @@ const noop = function () {}
 
 /**
  * A generator that returns a function which, when passed a promise, can treat that promise as a node style callback.
- * The primse advantage being that callbacks are better for error handling.
+ * The prime advantage being that callbacks are better for error handling.
  *
  * @param {Function} fn The function to handle as a callback
  * @param {Object} context The context in which the fn is to be called, most often a this reference