Removing made up word

Signed-off-by: John Howard <jhoward@microsoft.com>

docs/reference/run.md

@@ -121,7 +121,7 @@ and pass along signals. All of that is configurable:
 
     -a=[]           : Attach to `STDIN`, `STDOUT` and/or `STDERR`
     -t=false        : Allocate a pseudo-tty
-    --sig-proxy=true: Proxify all received signal to the process (non-TTY mode only)
+    --sig-proxy=true: Proxy all received signals to the process (non-TTY mode only)
     -i=false        : Keep STDIN open even if not attached
 
 If you do not specify `-a` then Docker will [attach all standard