[fix] change confusing error message (#32965)

This PR tries to correct a confusing message. For my little
understanding, it seems that if the code reaches that level, it is not
correct to say that setting TCP_USER_TIMEOUT failed, but actually it
succeeded (setsockopt returned 0) but is different to the previous value
option.

I haven't found the `gpr_log` description, so I hope the PR is correct.

---------

Signed-off-by: Joan Fontanals Martinez <joan.martinez@jina.ai>

src/core/lib/iomgr/socket_utils_common_posix.cc

@@ -357,8 +357,10 @@ grpc_error_handle grpc_set_socket_tcp_user_timeout(
           return absl::OkStatus();
         }
         if (newval != timeout) {
-          // Do not fail on failing to set TCP_USER_TIMEOUT for now.
-          gpr_log(GPR_ERROR, "Failed to set TCP_USER_TIMEOUT");
+          gpr_log(GPR_INFO,
+                  "Setting TCP_USER_TIMEOUT to value %d ms. Actual "
+                  "TCP_USER_TIMEOUT value is %d ms",
+                  timeout, newval);
           return absl::OkStatus();
         }
       }