chore: update wording in docs

docs/configuration.md

@@ -4,9 +4,9 @@ React Native CLI has a configuration mechanism that allows changing its behavior
 
 > Note: Configuring CLI used to be possible via `rn-cli.config.js` (that has been renamed to `metro.config.js`) and never documented `rnpm` entry on the `package.json`. We have provided migration guides where possible.
 
-React Native CLI can be configured by creating a `react-native.config.js` at the root of the project. Depending on a type of a package, this file can have a different set properties.
+React Native CLI can be configured by creating a `react-native.config.js` at the root of the project. Depending on the type of a package, the set of valid properties is different. 
 
-Check the documentation for:
+Check the documentation for
 - [projects](./projects.md)
 - [dependencies](./dependencies.md)
 - [platforms](./platforms.md)