better document the bootstrapping section

TILE_AUTHOR_GUIDE.md

@@ -46,9 +46,11 @@ It also expects these files:
 If you follow conventions you may experience the sweetness of running `kiln bake` without flags and getting a tile.
 Again, see [hello-tile](https://github.com/crhntr/hello-tile) (non-VMware employees) or the TAS repo (VMware employees) for tile source code that kiln "just works" with.
 
+
 #### Starting from scratch
 
-The following code does not create a working tile; it creates conventional defaults to start/standardize your tile authorship journey with Kiln.
+The following code bootstraps Product template parts from an empty directory working tile; it creates conventional defaults to start/standardize your tile authorship journey with Kiln.
+It does not generate source for a working tile.
 ```shell
 # Make directories and keep them around
 mkdir -p bosh_variables forms instance_groups jobs migrations properties releases runtime_configs
@@ -84,6 +86,13 @@ form_types: []
 EOF
 ```
 
+<details>
+<summary>PPE TODO</summary>
+
+Create a `kiln init` command that actually makes a working tile.
+
+</details>
+
 ## <a id="authoring-product-template-parts"></a> Authoring Product Template Parts
 
 A tile is a zip file with a ".pivotal" suffix.
@@ -96,7 +105,7 @@ Kiln expects certain directories to contain Product Template (metadata) parts.
 - `./forms` should contain YAML files that have [form_types](https://docs.pivotal.io/tiledev/2-9/property-template-references.html#form-properties)
 - `./instance_groups` should contain YAML files that have [job_types](https://docs.pivotal.io/tiledev/2-9/property-template-references.html#job-types)
 - `./jobs` should contain YAML files that have  [job templates](https://docs.pivotal.io/tiledev/2-9/property-template-references.html#job-template) and may contain a [job mainfest](https://docs.pivotal.io/tiledev/2-9/property-template-references.html#job-manifest)
-- `./migrations` should contain Javascript files that are migrations (TODO add link to ref)
+- `./migrations` should contain Javascript files that are migrations (TODO add link to specification)
 - `./properties` should contain YAML files that have [property-blueprints](https://docs.pivotal.io/tiledev/2-9/property-template-references.html#property-blueprints)
 - `./releases` should be an empty directory (maybe containing .gitkeep) and will be where Kiln writes BOSH Release Tarballs
 - `./runtime_configs` should contain YAML files that have [runtime configs](https://docs.pivotal.io/tiledev/2-9/runtime-config.html)