Fix typo in the gclient reminder message

tools/githooks/lib/src/messages.dart

diff --git a/tools/githooks/lib/src/messages.dart b/tools/githooks/lib/src/messages.dart
index d524404..787a8a1 100644
--- a/tools/githooks/lib/src/messages.dart
+++ b/tools/githooks/lib/src/messages.dart
@@ -14,6 +14,6 @@
   final String postfix = io.stdout.supportsAnsiEscapes ? _reset : '';
   io.stderr.writeln('$command: The engine source tree has been updated.');
   io.stderr.writeln(
-    '\n${prefix}You man need to run "gclient sync -D"$postfix\n',
+    '\n${prefix}You may need to run "gclient sync -D"$postfix\n',
   );
 }