PCBC-748: fix *Option#expiry() return value in documentation stubs

Change-Id: Ia7e8e89efb513681a153613706003398c5007a37
Reviewed-on: http://review.couchbase.org/c/php-couchbase/+/144383
Tested-by: Build Bot <[email protected]>
Reviewed-by: Sergey Avseyev <[email protected]>

Author: avsej

api/couchbase.php

@@ -3751,7 +3751,7 @@ public function timeout(int $arg): ReplaceOptions
          * @param int|DateTimeInterface $arg the relative expiry time in seconds or DateTimeInterface object for absolute point in time
          * @return ReplaceOptions
          */
-        public function expiry(mixed $arg): UpsertOptions
+        public function expiry(mixed $arg): ReplaceOptions
         {
         }
 
@@ -3895,7 +3895,7 @@ public function timeout(int $arg): IncrementOptions
          * @param int|DateTimeInterface $arg the relative expiry time in seconds or DateTimeInterface object for absolute point in time
          * @return IncrementOptions
          */
-        public function expiry(mixed $arg): UpsertOptions
+        public function expiry(mixed $arg): IncrementOptions
         {
         }
 
@@ -3949,7 +3949,7 @@ public function timeout(int $arg): DecrementOptions
          * @param int|DateTimeInterface $arg the relative expiry time in seconds or DateTimeInterface object for absolute point in time
          * @return DecrementOptions
          */
-        public function expiry(mixed $arg): UpsertOptions
+        public function expiry(mixed $arg): DecrementOptions
         {
         }
 
@@ -4074,7 +4074,7 @@ public function cas(string $arg): MutateInOptions
          * @param int|DateTimeInterface $arg the relative expiry time in seconds or DateTimeInterface object for absolute point in time
          * @return MutateInOptions
          */
-        public function expiry(mixed $arg): UpsertOptions
+        public function expiry(mixed $arg): MutateInOptions
         {
         }