Merge pull request #26233 from yuexiao-wang/fix-readme

Fix readme doc for dockerd
(cherry picked from commit 1145c9b0d59dd1210e71799a68addee23884861b)

Signed-off-by: Misty Stanley-Jones <misty@docker.com>

cmd/dockerd/README.md

@@ -1,3 +1,3 @@
-docker.go contains Docker's main function.
+docker.go contains Docker daemon's main function.
 
 This file provides first line CLI argument parsing and environment variable setting.