[SQL Dallas] Removed Approx continous and discrete functions

Author: markingmyname

docs/t-sql/functions/approx-percentile-cont-transact-sql.md

@@ -16175,10 +16175,6 @@ items:
         items:
         - name: APPROX_COUNT_DISTINCT
           href: t-sql/functions/approx-count-distinct-transact-sql.md
-        - name: APPROX_PERCENTILE_CONT
-          href: t-sql/functions/approx-percentile-cont-transact-sql.md
-        - name: APPROX_PERCENTILE_DISC
-          href: t-sql/functions/approx-percentile-disc-transact-sql.md
         - name: AVG
           href: t-sql/functions/avg-transact-sql.md
         - name: CHECKSUM_AGG