docs(moment-dateadapter): add docs for moment adapter options

Describe how to set the MomentDateAdapter to parse dates as utc.
Describe the default behaviour of the MomentDateAdapter.
Add an example on how to configure MAT_MOMENT_DATA_ADAPTER_OPTIONS

Closes angular#7167

src/lib/datepicker/datepicker.md

@@ -246,6 +246,17 @@ export class MyComponent {
 
 <!-- example(datepicker-moment) -->
 
+By default the `MomentDateAdapter` will creates dates in your time zone specific locale. You can change the default behaviour to parse dates as UTC by providing the `MAT_MOMENT_DATA_ADAPTER_OPTIONS` and setting it to `useUtc: true`.
+
+```ts
+@NgModule({
+  imports: [MatDatepickerModule, MatMomentDateModule],
+  providers: [
+    { provide: MAT_MOMENT_DATE_ADAPTER_OPTIONS, useValue: { useUtc: true } }
+  ]
+})
+```
+
 It is also possible to create your own `DateAdapter` that works with any date format your app
 requires. This is accomplished by subclassing `DateAdapter` and providing your subclass as the
 `DateAdapter` implementation. You will also want to make sure that the `MAT_DATE_FORMATS` provided