docs($provide): fix Markdown formatting for provider method

Indentation made Markdown parser think that it’s a block of code.

Closes angular#5446

Author: gurdiga

src/auto/injector.js

@@ -354,11 +354,9 @@ function annotate(fn) {
  * @param {(Object|function())} provider If the provider is:
  *
  *   - `Object`: then it should have a `$get` method. The `$get` method will be invoked using
- *               {@link AUTO.$injector#invoke $injector.invoke()} when an instance needs to be
- *               created.
- *   - `Constructor`: a new instance of the provider will be created using
- *               {@link AUTO.$injector#instantiate $injector.instantiate()}, then treated as
- *               `object`.
+ *     {@link AUTO.$injector#invoke $injector.invoke()} when an instance needs to be created.
+ *   - `Constructor`: a new instance of the provider will be created using                     
+ *     {@link AUTO.$injector#instantiate $injector.instantiate()}, then treated as `object`.
  *
  * @returns {Object} registered provider instance