Docs: capitalization and cross-reference in Configuration.md (#2788)

docs/Configuration.md

@@ -252,7 +252,7 @@ Default: `[]`
 A list of paths to snapshot serializer modules Jest should use for snapshot
 testing.
 
-Jest has default serializers for built-in javascript types and for react
+Jest has default serializers for built-in JavaScript types and for React
 elements. See [snapshot test tutorial](/jest/docs/tutorial-react-native.html#snapshot-test) for more information.
 
 Example serializer module:
@@ -304,6 +304,8 @@ Pretty foo: Object {
 }
 ```
 
+To make a dependency explicit instead of implicit, you can call [`expect.addSnapshotSerializer`](/jest/docs/expect.html#expectaddsnapshotserializerserializer) to add a module for an individual test file instead of adding its path to `snapshotSerializers` in Jest configuration.
+
 ### `testEnvironment` [string]
 Default: `"jsdom"`
 

docs/ExpectAPI.md

@@ -257,7 +257,6 @@ If you add a snapshot serializer in individual test files instead of to adding i
 * You make the dependency explicit instead of implicit.
 * You avoid limits to configuration that might cause you to eject from [create-react-app](https://github.com/facebookincubator/create-react-app).
 
-
 See [configuring package.json](/jest/docs/configuration.html#snapshotserializers-array-string) for more information.
 
 ### `.not`