minor fixes for shell provisioner docs and logging

provisioner/shell/provisioner.go

@@ -271,7 +271,7 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 			}
 			if err := comm.Start(cmd); err != nil {
 				return fmt.Errorf(
-					"Error chmodding script file to 0755 in remote "+
+					"Error chmodding script file to 0600 in remote "+
 						"machine: %s", err)
 			}
 			cmd.Wait()

website/source/docs/provisioners/shell.html.md

@@ -70,7 +70,7 @@ Optional parameters:
     declaring them inline in our execute_command. The default `execute_command`
     will be `chmod +x {{.Path}}; . {{.EnvVarFile}} && {{.Path}}`. This option is
     unnecessary for most cases, but if you have extra quoting in your custom
-    `execute_command`, then this may be neccecary for proper script execution.
+    `execute_command`, then this may be unnecessary for proper script execution.
     Default: false.
 
 -   `execute_command` (string) - The command to use to execute the script. By