update(docs): spellling corrections

Closes #815.

Author: ahmedshuhel

src/components/dialog/dialog.js

@@ -214,7 +214,7 @@ function MdDialogDirective($$rAF, $mdTheming) {
  *   - `locals` - `{object=}`: An object containing key/value pairs. The keys will be used as names
  *     of values to inject into the controller. For example, `locals: {three: 3}` would inject
  *     `three` into the controller, with the value 3. If `bindToController` is true, they will be
- *     coppied to the controller instead.
+ *     copied to the controller instead.
  *   - `bindToController` - `bool`: bind the locals to the controller, instead of passing them in
  *   - `resolve` - `{object=}`: Similar to locals, except it takes promises as values, and the
  *     dialog will not open until all of the promises resolve.

src/components/tabs/js/tabItemDirective.js

@@ -14,7 +14,7 @@ angular.module('material.components.tabs')
  * @description
  * `<md-tab>` is the nested directive used [within `<md-tabs>`] to specify each tab with a **label** and optional *view content*.
  *
- * If the `label` attribute is not specified, then an optional `<md-tab-label>` tag can be used to specified more
+ * If the `label` attribute is not specified, then an optional `<md-tab-label>` tag can be used to specify more
  * complex tab header markup. If neither the **label** nor the **md-tab-label** are specified, then the nested
  * markup of the `<md-tab>` is used as the tab header markup.
  *