Remove overly specific detail that we don't want to promise. Unspecified behaviour has its uses.

schemas/date.yaml

@@ -1,7 +1,5 @@
 description: |-
   Date without time part in ISO-8601 format. 
-  
-  Note on submitting dates to this API. Dates are processed using Java's java.util.GregorianCalender in non-lenient mode. That for example means that 2023-02-29, which was not in a leap year, is intepreted as 2023-03-01.
 type: string
 format: date
 example: "1970-01-13"