Fix docs link

CL: Fix docs link

PUBLISHED_FROM=d1092fb9886740fd90912700dca19ca62d4c4091

Author: cpq

README.md

@@ -3,7 +3,7 @@
 This service provides an ability to manage OTA on devices remotely.
 It is possible to call this service programmatically via serial, HTTP/RESTful,
 Websocket, MQTT or other transports
-(see [RPC section](/docs/mos/userguide/rpc.md)) or via the `mos` tool.
+(see [RPC section](/docs/mongoose-os/userguide/rpc.md)) or via the `mos` tool.
 
 See in-depth description of our OTA mechanism at
 [Updating firmware reliably - embedded.com](http://www.embedded.com/design/prototyping-and-development/4443082/Updating-firmware-reliably).