Clarify init's write command.

Bug: https://code.google.com/p/android/issues/detail?id=73996
Change-Id: I4f8d3927d17a4021a2436c2859aa732479c5a118
diff --git a/init/readme.txt b/init/readme.txt
index 613a9e9..26be536 100644
--- a/init/readme.txt
+++ b/init/readme.txt
@@ -257,9 +257,9 @@
   or the timeout has been reached. If timeout is not specified it
   currently defaults to five seconds.
 
-write <path> <string> [ <string> ]*
-   Open the file at <path> and write one or more strings
-   to it with write(2)
+write <path> <string>
+   Open the file at <path> and write a string to it with write(2)
+   without appending.
 
 
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