fix comment length

BUG=NONE
NOTRY=True

Review-Url: https://codereview.webrtc.org/2966743002
Cr-Commit-Position: refs/heads/master@{#18874}
diff --git a/webrtc/rtc_tools/video_analysis.py b/webrtc/rtc_tools/video_analysis.py
index 7dc8a2d..1a7bb48 100755
--- a/webrtc/rtc_tools/video_analysis.py
+++ b/webrtc/rtc_tools/video_analysis.py
@@ -408,7 +408,7 @@
 
 
 def CompareVideos(options, cropped_ref_file, cropped_test_file):
-  """Runs the compare_video.py script from webrtc/rtc_tools using the file path.
+  """Runs the compare_video.py script from src/webrtc/rtc_tools using path.
 
   Uses the path from recording_result and writes the output to a file named
   <options.app_name + '_' + CURRENT_TIME + '_result.txt> in the reference video