feat(logs): initial work on develop docs for sdk logging api

develop-docs/sdk/data-model/envelope-items.mdx

@@ -427,6 +427,44 @@ details.
 
 *None*
 
+### Logs
+
+Item type `"logs"` contains a logs payload encoded as JSON. Multiple log envelope items can be sent in a single envelope.
+
+See the <Link to="/sdk/telemetry/logs">Logs</Link> documentation for the payload
+details.
+
+**Constraints:**
+
+*None*
+
+**Envelope Headers:**
+
+*None*
+
+**Additional Item Headers:**
+
+*None*
+
+### Otel Logs
+
+Item type `"otel_logs"` contains an OpenTelemetry Logs payload encoded as JSON. Multiple Otel log envelope items can be sent in a single envelope.
+
+See the <Link to="/sdk/telemetry/logs">Logs</Link> documentation for the payload
+details.
+
+**Constraints:**
+
+*None*
+
+**Envelope Headers:**
+
+*None*
+
+**Additional Item Headers:**
+
+*None*
+
 ### Reserved Types
 
 Reserved types may not be written by any implementation. They are reserved for