docs: update stale deprecation version

Author: juliannguyen4

doc/client.rst

@@ -1236,7 +1236,7 @@ Info Operations
 
             kwGTUQKkYmluMQY=
 
-        .. deprecated:: 11.0.0
+        .. deprecated:: 19.3.0
             :ref:`aerospike.get_expression_base64` should be used instead.
 
     .. method:: shm_key()  ->  int
@@ -1454,7 +1454,7 @@ Index Operations
 
             Base64 encoding of ctxs: khAA
 
-        .. deprecated:: 11.0.0
+        .. deprecated:: 19.3.0
             :ref:`aerospike.get_cdtctx_base64` should be used instead.
 
     .. method:: index_string_create(ns, set, bin, name[, policy: dict])