Update docs to match new uri formatting

```properties

# ...

cm.updater.uri=http://my.ota.uri/api

cm.updater.uri=http://my.ota.uri/api/v1/{device}/{type}/{incr}

# ...

```

> As of [e930cf7](https://github.com/LineageOS/android_packages_apps_Updater/commit/e930cf7f67d10afcd933dec75879426126d8579a):  

> Optional placeholders replaced at runtime:  

>   {device} - Device name  

>   {type} - Build type  

>   {incr} - Incremental version

#### LineageOS ( >= 15.x)

In order to integrate this in your LineageOS based ROM, you need to add the [`lineage.updater.uri`](https://github.com/LineageOS/android_packages_apps_Updater/blob/lineage-15.0/src/org/lineageos/updater/misc/Constants.java#L39) property in your `build.prop` file. See this example:

```properties

# ...

lineage.updater.uri=http://my.ota.uri/api

lineage.updater.uri=http://my.ota.uri/api/v1/{device}/{type}/{incr}

# ...

```

> Since https://review.lineageos.org/#/c/191274/ is merged, the property `cm.updater.uri` is renamed to `lineage.updater.uri`. Make sure to update your entry.

> As of [5252d60](https://github.com/LineageOS/android_packages_apps_Updater/commit/5252d606716c3f8d81617babc1293c122359a94d):  

> Optional placeholders replaced at runtime:  

>   {device} - Device name  

>   {type} - Build type  

>   {incr} - Incremental version

### android_packages_apps_CMUpdater

In order to integrate this in your [CyanogenMod](https://github.com/lineageos/android_packages_apps_CMUpdater/blob/cm-14.1/res/values/config.xml#L12) or [LineageOS](https://github.com/LineageOS/android_packages_apps_Updater/blob/cm-14.1/res/values/strings.xml#L29) based ROM, you can patch the relative line inside the package.