Update documentation for `[New Feature]: Allow TTL attribute to also …

…be a partition or sort key`

See architect/inventory#71

src/views/docs/en/guides/backend/indexes.md

@@ -34,7 +34,8 @@ In this example you can query for an account by their username or email!
 - Otherwise, the basic syntax for defining `@indexes` is the same as `@tables`:
   - Partition key, defined by a `*`, is required
   - Sort key, defined by `**`, is optional
-  - Currently only `*String`, `**String`, `*Number` and `**Number` are supported
+  - Currently only `*String`, `**String`, `*Number`, `**Number`, `*TTL`, `**TTL`  are supported
+    - `*TTL` and `**TTL` is equivalent to `*Number` and `**Number` respectively, but also turns [time-to-live](./tables.md#time-to-live) on. 
 
 ## Examples
 

src/views/docs/en/guides/backend/tables.md

@@ -76,6 +76,7 @@ accounts
 - The required partition key is denoted by `*`
 - The optional sort key is denoted by `**`
 - Currently only `*String`, `**String`, `*Number` and `**Number` are supported
+  - `*TTL` and `**TTL` is equivalent to `*Number` and `**Number` respectively, but also turns [time-to-live](#time-to-live) on. 
 - Lambdas can only be values of: `insert`, `update`, or `destroy`
 
 > **Protip:** table names can be anything but choose a consistent naming scheme within your app namespace; one useful scheme is plural nouns like: `accounts` or `email-invites`