Fix a few inaccuracies / provide clarity (#31)

change one case where "attach" was used instead of "action"... and clarigy we are talking about an "action" in a couple places.
diff --git a/client/README.md b/client/README.md
index 7c0811e..dab1d6e 100644
--- a/client/README.md
+++ b/client/README.md
@@ -37,7 +37,7 @@
 
 ## Attaching to an action
 
-You can attach to an attach on startup by passing the action name to the initial invocation. Say for example you wish to attach to an action `foo`:
+You can attach to an action on startup by passing the action name to the initial invocation. Say for example you wish to attach to an action `foo`:
 
 ```ShellSession
 % ./wskdb foo
@@ -45,7 +45,7 @@
    Creating action trampoline
 ```
 
-You may also choose to launch the debugger and attach to `foo` later:
+You may also choose to launch the debugger and attach to action `foo` later:
 
 ```ShellSession
 (wskdb) attach foo