Update dockerfile_best-practices.md

Signed-off-by: Thell Fowler <Thell@tbfowler.name>

docs/sources/articles/dockerfile_best-practices.md

@@ -359,7 +359,7 @@ like `RUN groupadd -r postgres && useradd -r -g postgres postgres`.
 > rebuilds. So, if it’s critical, you should assign an explicit UID/GID.
 
 You should avoid installing or using `sudo` since it has unpredictable TTY and
-signal-forwarding behavior that can cause more more problems than it solves. If
+signal-forwarding behavior that can cause more problems than it solves. If
 you absolutely need functionality similar to `sudo` (e.g., initializing the
 daemon as root but running it as non-root), you may be able to use
 [“gosu”](https://github.com/tianon/gosu).