doc: Add missing reference to RemoteDebug component doc (#592)

Author: finger563

doc/en/index.rst

@@ -59,6 +59,7 @@ This is the documentation for esp-idf c++ components, ESPP (`espp <https://githu
    power/index
    qtpy
    qwiicnes
+   remote_debug
    rmt
    rtc/index
    rtsp