update description for partition router to be more helpful to users

Author: lmossman

airbyte_cdk/sources/declarative/declarative_component_schema.yaml

@@ -3616,7 +3616,7 @@ definitions:
         default: false
       partition_router:
         title: Partition Router
-        description: PartitionRouter component that describes how to partition the stream, enabling incremental syncs and checkpointing.
+        description: Used to iteratively execute requests over a set of values, such as a parent stream's records or a list of constant values.
         anyOf:
           - "$ref": "#/definitions/SubstreamPartitionRouter"
           - "$ref": "#/definitions/ListPartitionRouter"

airbyte_cdk/sources/declarative/models/declarative_component_schema.py

@@ -2837,7 +2837,7 @@ class SimpleRetriever(BaseModel):
         ]
     ] = Field(
         None,
-        description="PartitionRouter component that describes how to partition the stream, enabling incremental syncs and checkpointing.",
+        description="Used to iteratively execute requests over a set of values, such as a parent stream's records or a list of constant values.",
         title="Partition Router",
     )
     parameters: Optional[Dict[str, Any]] = Field(None, alias="$parameters")