README.rst: Fix definitions.rst path

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>
Signed-off-by: shettygururaj <gururaj.shetty@huawei.com>

README.rst

@@ -2,7 +2,7 @@
 ..
 .. SPDX-License-Identifier: CC-BY-4.0
 
-.. include:: ../definitions.rst
+.. include:: definitions.rst
 
 Welcome to OpenHarmony
 ##############################