BZ 6890: Fix DT_UNKNOWN description

[Andreas Jaeger]

Let's not confuse the user who reads "system" and thinks "OS" instead of "file system",

committed as obvious,

Andreas

2012-04-08  Andreas Jaeger  <aj@suse.de>

	[BZ #6890]
	* manual/filesys.texi (Directory Entries): Clarify that it's file
	system not operating system in the description of DT_UNKNOWN.

diff --git a/manual/filesys.texi b/manual/filesys.texi
index dc570df..04f4376 100644
--- a/manual/filesys.texi
+++ b/manual/filesys.texi
@@ -257,7 +257,8 @@ are defined for its value:
 
 @vtable @code
 @item DT_UNKNOWN
-The type is unknown.  On some systems this is the only value returned.
+The type is unknown.  Only some filesystems have full support to
+return the type of the file, others might always return this value.
 
 @item DT_REG
 A regular file.

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