Updated shebang from #!/bin/bash to #!/usr/bin/env bash (more flexible)

docsite/rst/guide_gce.rst

@@ -133,7 +133,7 @@ For the following use case, let's use this small shell script as a wrapper.
 
 .. code-block:: bash
 
-  #!/bin/bash
+  #!/usr/bin/env bash
   PLAYBOOK="$1"
 
   if [[ -z $PLAYBOOK ]]; then

hacking/env-setup

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # usage: source ./hacking/env-setup [-q]
 #    modifies environment for running Ansible from checkout