Update ENTRYPOINT/CMD table to agree with docs

Several other places in the document it states that when using the shell
form of ENTRYPOINT, CMD and command line arguments are ignored.  That is
accurate, this table was not.  It is now.

Signed-off-by: David Dooling <dooling@gmail.com>

docs/reference/builder.md

@@ -1154,12 +1154,12 @@ or for executing an ad-hoc command in a container.
 
 The table below shows what command is executed for different `ENTRYPOINT` / `CMD` combinations:
 
-|                                | No ENTRYPOINT              | ENTRYPOINT exec_entry p1_entry                            | ENTRYPOINT ["exec_entry", "p1_entry"]          |
-|--------------------------------|----------------------------|-----------------------------------------------------------|------------------------------------------------|
-| **No CMD**                     | *error, not allowed*       | /bin/sh -c exec_entry p1_entry                            | exec_entry p1_entry                            |
-| **CMD ["exec_cmd", "p1_cmd"]** | exec_cmd p1_cmd            | /bin/sh -c exec_entry p1_entry exec_cmd p1_cmd            | exec_entry p1_entry exec_cmd p1_cmd            |
-| **CMD ["p1_cmd", "p2_cmd"]**   | p1_cmd p2_cmd              | /bin/sh -c exec_entry p1_entry p1_cmd p2_cmd              | exec_entry p1_entry p1_cmd p2_cmd              |
-| **CMD exec_cmd p1_cmd**        | /bin/sh -c exec_cmd p1_cmd | /bin/sh -c exec_entry p1_entry /bin/sh -c exec_cmd p1_cmd | exec_entry p1_entry /bin/sh -c exec_cmd p1_cmd |
+|                                | No ENTRYPOINT              | ENTRYPOINT exec_entry p1_entry | ENTRYPOINT ["exec_entry", "p1_entry"]          |
+|--------------------------------|----------------------------|--------------------------------|------------------------------------------------|
+| **No CMD**                     | *error, not allowed*       | /bin/sh -c exec_entry p1_entry | exec_entry p1_entry                            |
+| **CMD ["exec_cmd", "p1_cmd"]** | exec_cmd p1_cmd            | /bin/sh -c exec_entry p1_entry | exec_entry p1_entry exec_cmd p1_cmd            |
+| **CMD ["p1_cmd", "p2_cmd"]**   | p1_cmd p2_cmd              | /bin/sh -c exec_entry p1_entry | exec_entry p1_entry p1_cmd p2_cmd              |
+| **CMD exec_cmd p1_cmd**        | /bin/sh -c exec_cmd p1_cmd | /bin/sh -c exec_entry p1_entry | exec_entry p1_entry /bin/sh -c exec_cmd p1_cmd |
 
 ## VOLUME