[Docs] Update daterange-aggregation.asciidoc (#44730)

Correcting the value to be the same as that specified for "missing".

docs/reference/aggregations/bucket/daterange-aggregation.asciidoc

@@ -104,7 +104,7 @@ POST /sales/_search?size=0
 // TEST[setup:sales]
 
 <1> Documents without a value in the `date` field will be added to the "Older"
-bucket, as if they had a date value of "1899-12-31". 
+bucket, as if they had a date value of "1976-11-30". 
 
 [[date-format-pattern]]
 ==== Date Format/Pattern