Don't mention 'transformed dependencies'. (#2199)

This documentation relates to when Dart 1.x when pub did more than
fetching dependencies and pre-compiling executables.
diff --git a/lib/src/command/get.dart b/lib/src/command/get.dart
index 5afa2c7..b941140 100644
--- a/lib/src/command/get.dart
+++ b/lib/src/command/get.dart
@@ -28,7 +28,7 @@
 
     argParser.addFlag('precompile',
         defaultsTo: true,
-        help: "Precompile executables and transformed dependencies.");
+        help: "Precompile executables in immediate dependencies.");
 
     argParser.addFlag('packages-dir', negatable: true, hide: true);
   }
diff --git a/lib/src/command/upgrade.dart b/lib/src/command/upgrade.dart
index 6f93b62..e65e75c 100644
--- a/lib/src/command/upgrade.dart
+++ b/lib/src/command/upgrade.dart
@@ -30,7 +30,7 @@
 
     argParser.addFlag('precompile',
         defaultsTo: true,
-        help: "Precompile executables and transformed dependencies.");
+        help: "Precompile executables in immediate dependencies.");
 
     argParser.addFlag('packages-dir', negatable: true, hide: true);
   }