[R4][AllergyIntolerance] Support search by _lastUpdated

content/millennium/r4/clinical/summary/allergy-intolerance.md

@@ -84,6 +84,7 @@ Search for AllergyIntolerances that meet supplied query parameters:
  `patient`          | This or `_id`      | [`reference`] | Who the sensitivity is for. Example: `patient=12345`
  `clinical-status`  | No                 | [`token`]     | The clinical status of the allergy or intolerance. Example: `active`, `inactive`, `resolved`
  `_revinclude`      | No                 | [`token`]     | Provenance resource entries to be returned as part of the bundle. Example: `_revinclude=Provenance:target`
+ `_lastUpdated`     | No                 | [`date`]      | Date range in which the allergy or intolerance was last updated. Either 1 or 2 date/times can be given. Example: `_lastUpdated=gt2014-09-24` or `_lastUpdated=lt2015-09-24T12:00:00.000Z`
 
 Notes:
 
@@ -97,6 +98,8 @@ Notes:
 
 - When `_revinclude` is provided in a request to the closed endpoint, the OAuth2 token must include the scope corresponding to the Authorization Type, such as `user/Provenance.read`, `patient/Provenance.read` or `system/Provenance.read`.
 
+- The `_lastUpdated` parameters may be provided up to two times, and must use the `eq`, `ge`, `gt`, `le`, or `lt` prefixes. When a value is provided without a prefix, an implied `eq` prefix is used. When provided twice, the lower value must have a `ge` or `gt` prefix and the higher value must have an `le` or `lt` prefix.
+
 ### Headers
 
 <%= headers fhir_json: true %>
@@ -308,6 +311,7 @@ The common [errors] and [OperationOutcomes] may be returned.
 
 [`reference`]: https://hl7.org/fhir/r4/search.html#reference
 [`token`]: https://hl7.org/fhir/R4/search.html#token
+[`date`]: http://hl7.org/fhir/R4/search.html#date
 [errors]: ../../../#client-errors
 [OperationOutcomes]: ../../../#operation-outcomes
 [Precision Extension]: https://fhir-ehr.cerner.com/r4/StructureDefinition/precision?_format=json