More documentation (#10589)

diff --git a/packages/flutter_tools/lib/src/commands/build_aot.dart b/packages/flutter_tools/lib/src/commands/build_aot.dart
index 10f79bb..22e0b2c 100644
--- a/packages/flutter_tools/lib/src/commands/build_aot.dart
+++ b/packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -82,7 +82,7 @@
   return fs.path.dirname(packageMap.map[package].toFilePath());
 }
 
-/// Build an AOT snapshot. Return `null` (and log to `printError`) if the method
+/// Build an AOT snapshot. Return null (and log to `printError`) if the method
 /// fails.
 Future<String> buildAotSnapshot(
   String mainPath,

diff --git a/packages/flutter_tools/lib/src/commands/config.dart b/packages/flutter_tools/lib/src/commands/config.dart
index 11f7e07..16c0629 100644
--- a/packages/flutter_tools/lib/src/commands/config.dart
+++ b/packages/flutter_tools/lib/src/commands/config.dart

@@ -42,7 +42,7 @@
       'Analytics reporting is currently ${flutterUsage.enabled ? 'enabled' : 'disabled'}.';
   }
 
-  /// Return `null` to disable tracking of the `config` command.
+  /// Return null to disable tracking of the `config` command.
   @override
   Future<String> get usagePath => null;
 

diff --git a/packages/flutter_tools/lib/src/commands/create.dart b/packages/flutter_tools/lib/src/commands/create.dart
index cf8c3ec..cb60d49 100644
--- a/packages/flutter_tools/lib/src/commands/create.dart
+++ b/packages/flutter_tools/lib/src/commands/create.dart

@@ -311,7 +311,7 @@
   'yaml'
 ]);
 
-/// Return `null` if the project name is legal. Return a validation message if
+/// Return null if the project name is legal. Return a validation message if
 /// we should disallow the project name.
 String _validateProjectName(String projectName) {
   if (!package_names.isValidPackageName(projectName))
@@ -324,7 +324,7 @@
   return null;
 }
 
-/// Return `null` if the project directory is legal. Return a validation message
+/// Return null if the project directory is legal. Return a validation message
 /// if we should disallow the directory name.
 String _validateProjectDir(String dirPath, { String flutterRoot }) {
   if (fs.path.isWithin(flutterRoot, dirPath)) {