ci: fix name of freertos recipe

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

ci/manifest.rst

@@ -132,7 +132,7 @@ may be included.
 freertos-armv5
 ..............
 
-This job builds ``zephyr-philosophers`` using ``FLAVOUR=freertos`` and
+This job builds ``freertos-demo`` using ``FLAVOUR=freertos`` and
 ``MACHINE=qemuarmv5``. This job checks that FreeRTOS can be built for a basic
 32bit ARMv5 micro-controller virtual machine.