Incorrect includeReferrals part parameter name

[AndrewGuiseley]

Currently, the includeReferrals part parameter is listed as referralSearchPeriod on the https://developer.nhs.uk/apis/gpconnect-1-6-0/accessrecord_structured_development_retrieve_patient_record.html#payload-request-body page.

However, referralsSearchperiod is incorrectly displayed on https://developer.nhs.uk/apis/gpconnect-1-6-0/accessrecord_structured_development_fhir_examples_referrals.html.

This request is to replace the incorrect part parameter on the ReferralRequest example page (and anywhere else in the spec it may be listed.