[MAN] Clarify two redirection mechanisms

[saulery@xxxxxxx]

From: Stéphane Aulery <saulery@xxxxxxx>

Close Debian Bug #501566
---
 src/dash.1 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/dash.1 b/src/dash.1
index d782882..429657a 100644
--- a/src/dash.1
+++ b/src/dash.1
@@ -402,11 +402,13 @@ Append standard output (or n) to file.
 .It [n] Ns \*[Lt] file
 Redirect standard input (or n) from file.
 .It [n1] Ns \*[Lt]& Ns n2
-Duplicate standard input (or n1) from file descriptor n2.
+Redirect standard input (or fd n1) from the same resource as currently open on
+fd n2.
 .It [n] Ns \*[Lt]&-
 Close standard input (or n).
 .It [n1] Ns \*[Gt]& Ns n2
-Duplicate standard output (or n1) to n2.
+Redirect standard output (or fd n1) to the same resource as currently open on
+fd n2.
 .It [n] Ns \*[Gt]&-
 Close standard output (or n).
 .It [n] Ns \*[Lt]\*[Gt] file
-- 
2.1.3

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