doc: document fs.datasync(Sync)

The APIs are implemented but currently not documented.
nodejs · Feb 25, 2016 · f5773ec · f5773ec
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commit f5773ec
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diff --git a/doc/api/fs.markdown b/doc/api/fs.markdown
@@ -436,6 +436,15 @@ to the completion callback.
 
 Synchronous fchown(2). Returns `undefined`.
 
+## fs.fdatasync(fd, callback)
+
+Asynchronous fdatasync(2). No arguments other than a possible exception are
+given to the completion callback.
+
+## fs.fdatasyncSync(fd)
+
+Synchronous fdatasync(2). Returns `undefined`.
+
 ## fs.fstat(fd, callback)
 
 Asynchronous fstat(2). The callback gets two arguments `(err, stats)` where