fix docs refs

Author: IanButterworth

stdlib/FileWatching/docs/src/index.md

@@ -11,7 +11,7 @@ FileWatching.unwatch_folder
 # Pidfile
 
 ```@meta
-CurrentModule = Pidfile
+CurrentModule = FileWatching.Pidfile
 ```
 
 A simple utility tool for creating advisory pidfiles (lock files).
@@ -27,11 +27,11 @@ close
 ## Helper Functions
 
 ```@docs
-Pidfile.open_exclusive
-Pidfile.tryopen_exclusive
-Pidfile.write_pidfile
-Pidfile.parse_pidfile
-Pidfile.stale_pidfile
-Pidfile.isvalidpid
-Base.touch(::Pidfile.LockMonitor)
+FileWatching.Pidfile.open_exclusive
+FileWatching.Pidfile.tryopen_exclusive
+FileWatching.Pidfile.write_pidfile
+FileWatching.Pidfile.parse_pidfile
+FileWatching.Pidfile.stale_pidfile
+FileWatching.Pidfile.isvalidpid
+Base.touch(::FileWatching.Pidfile.LockMonitor)
 ```