init: Fix README.md for writepid

writepid takes a list of space delimited files.  Make this clear in
the documentation, following the format for repeated fields used in
the rest of the file.

Test: N/A
Change-Id: I5bbe453fcb54f060d3cc5a82e9b38d3091a1ece3
diff --git a/init/README.md b/init/README.md
index 99522b9..9114075 100644
--- a/init/README.md
+++ b/init/README.md
@@ -201,7 +201,7 @@
 `onrestart`
 > Execute a Command (see below) when service restarts.
 
-`writepid <file...>`
+`writepid <file> [ <file>\* ]`
 > Write the child's pid to the given files when it forks. Meant for
   cgroup/cpuset usage. If no files under /dev/cpuset/ are specified, but the
   system property 'ro.cpuset.default' is set to a non-empty cpuset name (e.g.