docs(share_medical_records): fix PatientData field types to match code

[giwaov]

Summary

• Fixed gender field type: u8 → bool
• Fixed weight field type: u64 → u16

Issue

The PatientData struct in the README showed incorrect types that don't match the actual implementation in share_medical_records/encrypted-ixs/src/lib.rs.

Verification

Confirmed against actual struct definition:

pub struct PatientData {
    pub patient_id: u64,
    pub age: u8,
    pub gender: bool,     // README had u8
    pub blood_type: u8,
    pub weight: u16,      // README had u64
    pub height: u16,
    pub allergies: [bool; 5],
}

Test plan

• Verify README struct now matches actual source code