revert erroneous AI deletion

Author: pnilan

airbyte_cdk/sources/declarative/declarative_component_schema.yaml

@@ -168,7 +168,7 @@ definitions:
           - X-Auth-Token
       inject_into:
         title: Inject API Key Into Outgoing HTTP Request
-        description: Configure how the API Key will be sent in requests to the source API.
+        description: Configure how the API Key will be sent in requests to the source API. Either inject_into or header has to be defined.
         "$ref": "#/definitions/RequestOption"
         examples:
           - inject_into: header

airbyte_cdk/sources/declarative/models/declarative_component_schema.py

@@ -1654,7 +1654,7 @@ class ApiKeyAuthenticator(BaseModel):
     )
     inject_into: Optional[RequestOption] = Field(
         None,
-        description="Configure how the API Key will be sent in requests to the source API.",
+        description="Configure how the API Key will be sent in requests to the source API. Either inject_into or header has to be defined.",
         examples=[
             {"inject_into": "header", "field_name": "Authorization"},
             {"inject_into": "request_parameter", "field_name": "authKey"},