Fix links in Jetnews README.

Change-Id: I295d49c5358bc37e299f0b9c721df02095adb1ad

Author: nickbutcher

JetNews/README.md

@@ -27,9 +27,9 @@ Package [`com.example.jetnews.ui`][1]
 [`JetnewsApp.kt`][2] arranges the different screens in the `NavDrawerLayout`. It also implements a simple
 navigation pattern.
 
-[1]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui
-[2]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/JetnewsApp.kt
-[3]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/article
+[1]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui
+[2]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/JetnewsApp.kt
+[3]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/article
 
 ### Main article list
 
@@ -38,15 +38,15 @@ Package [`com.example.jetnews.ui.home`][4]
 This screen shows how to create different custom Composable functions and combine them in a list
 that scrolls vertically and horizontally.
 
-See how to :
+See how to:
 
-* use Rows and Columns to arrange the contents of the UI
-* add an AppBar
-* use Material Typography and opacity to style the text
-* use Shape to round the corners of the images
-* use Elevation to make the Cards stand out from the background
+* Use `Row`s and `Column`s to arrange the contents of the UI
+* Add an `AppBar`
+* Use `MaterialTypography` and opacity to style the text
+* Use `Shape` to round the corners of the images
+* Use elevation to make the `Card`s stand out from the background
 
-[4]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/home
+[4]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/home
 
 ### Article detail
 
@@ -55,8 +55,8 @@ Package [`com.example.jetnews.ui.article`][5]
 This screen dives into the Text API, showing how to use different fonts than the ones defined in
 [`Typograhy`][6]. It also adds a bottom appbar, with custom actions.
 
-[5]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/article
-[6]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/Typography.kt
+[5]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/article
+[6]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/Typography.kt
 
 ### Interests screen
 
@@ -69,16 +69,15 @@ the on/off behaviour and semantics, while drawing a custom UI. The UI of the but
 drawn with low-level primitives and partly overlaying images. See also how to visualize
 on and off, light and dark version in the Android Studio Preview.
 
-[7]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/interests
-[8]: https://github.com/android/compose-samples/Jetnews/app/src/main/java/com/example/jetnews/ui/interests/SelectTopicButton.kt
+[7]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/interests
+[8]: https://github.com/android/compose-samples/tree/master/JetNews/app/src/main/java/com/example/jetnews/ui/interests/SelectTopicButton.kt
 
 ### Data
 
 The data in the sample is static, held in the `com.example.jetnews.data` package.
 
 ## License
 
-
 ```
 Copyright 2019 Google, Inc.