Fix example when_present example prompt

Author: aschwa

docs/pydantic.md

@@ -70,6 +70,7 @@ client = DotTxt()
 result = client.generate(
     model="openai/gpt-oss-20b",
     input=(
+        "User lives at 1 main street and has credit card number `12345678910`."
         "Return a JSON object representing a payment payload. "
         "Include credit_card and billing_address fields."
     ),

examples/pydantic_conditionals_when_present.py

@@ -22,6 +22,7 @@ class Payment(ConditionalModel, BaseModel):
     result = client.generate(
         model="openai/gpt-oss-20b",
         input=(
+            "User lives at 1 main street and has credit card number `12345678910`."
             "Return a JSON object representing a payment payload. "
             "Include credit_card and billing_address fields."
         ),