[patch] Please document the fact that df ignores reserved space

[Jean-Michel Vourgère]

Hello

I was surprised to discover that df ignores the reserved space set by tune2fs -m
It's nice, but it would be nicer still to document it.

Attached is a patch for df manual. Please review it carefuly as English is not 
my native language.

Thanks.

--- coreutils-8.32.orig/man/df.x
+++ coreutils-8.32/man/df.x
@@ -26,4 +26,9 @@ file system containing the device node.
 cannot show the space available on unmounted file systems, because on
 most kinds of systems doing so requires very nonportable intimate
 knowledge of file system structures.
+.PP
+.B df
+ignores reserved space, like the ones set by tune2fs -m. So a device may show
+100% usage, and the privildged user may still be able to increase storage in
+it.
 .SH OPTIONS

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