docs: add workaround tip for modifying menu options

Document the #1 but... pattern for users who want a modified version
of an existing AskUserQuestion option without retyping it.

Closes #385

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

get-shit-done/references/questioning.md

@@ -95,6 +95,9 @@ User mentions "frustrated with current tools"
 - question: "What specifically frustrates you?"
 - options: ["Too many clicks", "Missing features", "Unreliable", "Let me explain"]
 
+**Tip for users — modifying an option:**
+Users who want a slightly modified version of an option can select "Other" and reference the option by number: `#1 but for finger joints only` or `#2 with pagination disabled`. This avoids retyping the full option text.
+
 </using_askuserquestion>
 
 <context_checklist>