Update chatapp_tutorial.md

[chicago4kbike]

set_question1 to set_question
set_question2 to set_question
set_question3 to set_question

[greptile-apps]

Greptile Summary

This PR fixes three typos in the chat app tutorial (docs/getting_started/chatapp_tutorial.md), correcting incorrect event handler names in code snippets.

• In Reflex, the auto-generated setter for a state variable question is always set_question. The tutorial previously referenced State.set_question1, State.set_question2, and State.set_question3 (at lines ~454, ~494, and ~605 respectively), which would cause a runtime AttributeError if a reader copied the code directly.
• All three occurrences are now corrected to State.set_question, which is consistent with the surrounding tutorial prose and the python exec live demo blocks already using the correct name.

Confidence Score: 5/5

• This PR is safe to merge — it is a pure documentation fix with no executable production code changes.
• The change is limited to a single markdown tutorial file. It corrects three clearly wrong event handler names to the correct Reflex-generated setter name, making the tutorial code accurate and copy-pasteable. No application logic, tests, or configuration is touched.
• No files require special attention.

Important Files Changed

Filename	Overview
docs/getting_started/chatapp_tutorial.md	Documentation fix: three incorrect event handler references (set_question1, set_question2, set_question3) corrected to the proper Reflex auto-generated setter set_question. No logic or structural issues.

Sequence Diagram

sequenceDiagram
    participant User
    participant Frontend (action_bar)
    participant State
    participant OpenAI API

    User->>Frontend (action_bar): Types question
    Frontend (action_bar)->>State: on_change → set_question(value)
    State-->>Frontend (action_bar): question state updated

    User->>Frontend (action_bar): Clicks "Ask"
    Frontend (action_bar)->>State: on_click → answer()
    State->>OpenAI API: Send prompt
    OpenAI API-->>State: Stream response chunks
    loop Streaming
        State-->>Frontend (action_bar): yield → update chat_history
    end
    State-->>Frontend (action_bar): question cleared (self.question = "")

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_{Last reviewed commit: 3053d34}