uuencode: tweak help text

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/coreutils/uuencode.c b/coreutils/uuencode.c
index 84a489a..673ef36 100644
--- a/coreutils/uuencode.c
+++ b/coreutils/uuencode.c
@@ -9,9 +9,9 @@
  */
 
 //usage:#define uuencode_trivial_usage
-//usage:       "[-m] [INFILE] STORED_FILENAME"
+//usage:       "[-m] [FILE] STORED_FILENAME"
 //usage:#define uuencode_full_usage "\n\n"
-//usage:       "Uuencode a file to stdout\n"
+//usage:       "Uuencode FILE (or stdin) to stdout\n"
 //usage:     "\n	-m	Use base64 encoding per RFC1521"
 //usage:
 //usage:#define uuencode_example_usage