Add more context on SpS (#497)

docs/new/consume/subgraph/subgraph.md

@@ -3,6 +3,11 @@ It is possible to the send data the of a Substreams to a subgraph, thus creating
 There are two ways of making Substreams interact with subgraphs:
 - Create a special [graph_out module](./graph-out.md) that emits an [EntityChanges](https://github.com/streamingfast/substreams-sink-entity-changes/blob/develop/proto/sf/substreams/sink/entity/v1/entity.proto#L11) Protobuf.
 The subgraph will read the `EntityChanges` object and consume the data.
-- Use the [**Substreams triggers**](./triggers.md) to consume Substreams Protobuf inside your subgraph.
+- Use the [**Substreams triggers**](./triggers.md) to consume Substreams Protobuf directly inside your subgraph.
+
+## What Option To Use
+Both are valid options depending on the use case:
+- Use the `graph_out` module is if your logic is entirely in the Substreams Rust code. You will create the subgraph entities in the Substreams and the subgraph will only read them.
+- Use the **Substreams triggers** if you want to use Substreams as an extraction layer for the data, but the logic of your application will be in the subgraph AssemblyScript code.
 
 <figure><img src="../../../.gitbook/assets/consume/service-subgraph.png" width="100%" /></figure>

docs/new/references/chains-and-endpoints.md

@@ -54,6 +54,7 @@ Protobuf definitions and public endpoints are provided for the supported protoco
 * **Arweave Mainnet**: `mainnet.arweave.streamingfast.io:443`
 * **Bitcoin Mainnet**: `mainnet.btc.streamingfast.io:443`
 * **Injective Mainnet**: `mainnet.injective.streamingfast.io:443`
+* **Injective Testnet**: `testnet.injective.streamingfast.io:443`
 
 ## Community Endpoints