content-hub guide is confusing in examples

[Leo Iannacone]

I was reading this guide:
https://developer.ubuntu.com/en/apps/platform/guides/content-hub-guide

while the first part is really well written, the second one is a bit confusing and mess up in examples.

I'm referring to the second part as starting from "App registration as source or destination".

There we find this snip for the manifest.json:
```
hooks": {
        "APPONE": {
            "apparmor": "APPONE.json",
            "content-hub": "APPONE.json",
            "desktop": "APPNAME.desktop"
        }
```

so we assume that a APPONE has:
 * an apparmor file called APPONE.json
 * a content-hub file called APPONE.json
 * a desktop file called APPNAME.desktop

so we are saying that apparmor and content-hub files are the same, and APPONE != APPNAME. Is it right?

No, I don't thing so... The right snip of code should be something like:
```
hooks": {
        "APPNAME": {
            "apparmor": "APPNAME.apparmor",
            "content-hub": "APPNAME.content.json",
            "desktop": "APPNAME.desktop"
        }
```

And the issue propagates below.. in fact at some point we read:
```
Let’s look at one of these, APPONE.json:
{
    "source": [
        "pictures"
    ]
}
```

so, that's APPONE.json (not specified if for apparmor or for content-hub, I assume it's the content-hub's one, but it's not specified)...

And (again) some some lines after that:
```
Looking at APPONE.json, we may see something like this:

{
    "policy_groups": [
        "networking",
        "content_exchange"
    ],
    "policy_version": 1
}
```

Here I assume that the snip refers to the apparmor configuration, but again.. this is not clear!.

If a developer reads this guide for the first time (I tried to understand and to study how Content-Hub works) can be confused by those filenames.

Please consider a review for the second part as soon as possible.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: content-hub 0.0+15.04.20150123-0ubuntu1
ProcVersionSignature: Ubuntu 3.18.0-14.15-generic 3.18.7
Uname: Linux 3.18.0-14-generic x86_64
ApportVersion: 2.16.1-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Feb 27 19:53:02 2015
InstallationDate: Installed on 2014-09-18 (161 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140917)
SourcePackage: content-hub
SystemImageInfo:
 current build number: 0
 device name:
 channel: daily
 last update: Unknown
UpgradeStatus: Upgraded to vivid on 2015-01-23 (35 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.