update docs (#265)

Co-authored-by: SockworkOrange <26390445+SockworkOrange@users.noreply.github.com>

Author: github-actions[bot]

README.md

@@ -12,8 +12,8 @@ version: "2"
 plugins:
 - name: csharp
   wasm:
-    url: https://github.com/DaredevilOSS/sqlc-gen-csharp/releases/download/v0.19.0/sqlc-gen-csharp.wasm
-    sha256: 82e1a2dfc44ba5052c1e310aa2cda82d2825b8dc57000ce4dd6519249e5ea0fe
+    url: https://github.com/DaredevilOSS/sqlc-gen-csharp/releases/download/v0.20.0/sqlc-gen-csharp.wasm
+    sha256: 3d0a7d09a93b6135c4e043acbbd862d28e2535f20a43292a842a75ac37f35aa0
 sql:
   # For PostgresSQL
   - schema: schema.sql
@@ -158,8 +158,16 @@ More info can be found in [here](https://docs.sqlc.dev/en/stable/howto/transacti
 <details>
 <summary>:execlastid - Implementation</summary>
 
-Implemented via a `RETURNING` clause, allowing the `INSERT` command to return the newly created id, which can be of any
-data type that can have a unique constraint.
+Implemented via a `RETURNING` clause, allowing the `INSERT` command to return the newly created id.
+The data types that can be used as id data types for this annotation are:
+1. uuid
+2. bigint
+3. integer
+4. smallint (less recommended due to small id range, but possible)
+
+```sql
+INSERT INTO tab1 (field1, field2) VALUES ('a', 1) RETURNING id_field;
+```
 </details>
 
 <details>
@@ -312,13 +320,12 @@ we consider support for the different data types separately for batch inserts an
 <summary>:execlastid - Implementation</summary>
 
 ## :execlastid - Implementation
-Implemented via a `RETURNING` clause, allowing the `INSERT` command to return the newly created id, which can be of any
-data type that can have a unique constraint.
-
+Implemented via a `RETURNING` clause, allowing the `INSERT` command to return the newly created id.
+Only integer data type is supported as id for this annotation.
+   
 ```sql
 INSERT INTO tab1 (field1, field2) VALUES ('a', 1) RETURNING id_field;
 ```
-
 </details>
 
 <details>

docs/02_Quickstart.md

@@ -4,8 +4,8 @@ version: "2"
 plugins:
 - name: csharp
   wasm:
-    url: https://github.com/DaredevilOSS/sqlc-gen-csharp/releases/download/v0.19.0/sqlc-gen-csharp.wasm
-    sha256: 82e1a2dfc44ba5052c1e310aa2cda82d2825b8dc57000ce4dd6519249e5ea0fe
+    url: https://github.com/DaredevilOSS/sqlc-gen-csharp/releases/download/v0.20.0/sqlc-gen-csharp.wasm
+    sha256: 3d0a7d09a93b6135c4e043acbbd862d28e2535f20a43292a842a75ac37f35aa0
 sql:
   # For PostgresSQL
   - schema: schema.sql