doc: improve 'rm -f' description

* doc/coreutils.texi (rm invocation): Mention that the -f option also
silences the message for missing operands, which is useful in scripts
e.g., for "rm -f $file_list" when $file_list is empty.
* src/rm.c (usage):  Likewise.
Reported by Jérémy Magrin in http://bugs.gnu.org/10819

3 files changed, 3 insertions, 2 deletions

diff --git a/THANKS.in b/THANKS.in
index 904bb3eda..c8dd75f85 100644
--- a/THANKS.in
+++ b/THANKS.in
@@ -276,6 +276,7 @@ Jens Elkner                         elkner@imsgroup.de
 Jens Schmidt                        jms@jsds.hamburg.com
 Jeph Cowan                          jeph@ucar.edu
 Jeremy Maitin-Shepard               jbms@cmu.edu
+Jérémy Magrin                       jeremy.magrin@epitech.eu
 Jerome Abela                        abela@hsc.fr
 Jérôme Zago                         bug-coreutils-ml@agt-the-walker.net
 Jesse Kornblum                      kornblum@usna.edu
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 02c3a2a5d..8c6a2870f 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -8769,7 +8769,7 @@ The program accepts the following options.  Also see @ref{Common options}.
 @itemx --force
 @opindex -f
 @opindex --force
-Ignore nonexistent files and never prompt the user.
+Ignore nonexistent files and missing operands, and never prompt the user.
 Ignore any previous @option{--interactive} (@option{-i}) option.
 
 @item -i
diff --git a/src/rm.c b/src/rm.c
index db525d02c..02809f214 100644
--- a/src/rm.c
+++ b/src/rm.c
@@ -135,7 +135,7 @@ usage (int status)
       fputs (_("\
 Remove (unlink) the FILE(s).\n\
 \n\
-  -f, --force           ignore nonexistent files, never prompt\n\
+  -f, --force           ignore nonexistent files and arguments, never prompt\n\
   -i                    prompt before every removal\n\
 "), stdout);
       fputs (_("\