put the sdk manager command in a code block (kivy#1956)

tshirtman · inclement · commit cb6035a16c01 · 2019-08-17T23:48:48.000+01:00
to avoid quotes being replaced by fancy ones
diff --git a/doc/source/quickstart.rst b/doc/source/quickstart.rst
@@ -125,10 +125,11 @@ First, install an API platform to target. **The recommended *target* API
 level is 27**, you can replace it with a different number but
 keep in mind other API versions are less well-tested and older devices
 are still supported down to the **recommended specified *minimum*
-API/NDK API level 21**:
+API/NDK API level 21**::
 
   $SDK_DIR/tools/bin/sdkmanager "platforms;android-27"
 
+
 Second, install the build-tools. You can use
 ``$SDK_DIR/tools/bin/sdkmanager --list`` to see all the
 possibilities, but 28.0.2 is the latest version at the time of writing::
