Clarify USER instruction documentation
Reuse WORKDIR wording to specify that the USER instructions affect the
following RUN, CMD, and ENTRYPOINT instructions.
@@ -731,7 +731,8 @@ documentation.
USER daemon
The `USER` instruction sets the user name or UID to use when running the image
-and for any following `RUN` directives.
+and for any `RUN`, `CMD` and `ENTRYPOINT` instructions that follow it in the
+`Dockerfile`.
## WORKDIR
