Fix force_fieldtrials documentation in video_loopback

Bug: None
Change-Id: I49bb3ee249c7dfec5f97ee974bfa717ebe711519
Reviewed-on: https://webrtc-review.googlesource.com/c/106080
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25181}
diff --git a/video/video_loopback.cc b/video/video_loopback.cc
index e626b3f..b6715ac 100644
--- a/video/video_loopback.cc
+++ b/video/video_loopback.cc
@@ -262,7 +262,7 @@
     force_fieldtrials,
     "",
     "Field trials control experimental feature code which can be forced. "
-    "E.g. running with --force_fieldtrials=WebRTC-FooFeature/Enable/"
+    "E.g. running with --force_fieldtrials=WebRTC-FooFeature/Enabled/"
     " will assign the group Enable to field trial WebRTC-FooFeature. Multiple "
     "trials are separated by \"/\"");