*: --help tweaks

function                                             old     new   delta
.rodata                                           103190  103189      -1
packed_usage                                       33590   33566     -24
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(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-25)             Total: -25 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/procps/watch.c b/procps/watch.c
index 059eb1d..1190b29 100644
--- a/procps/watch.c
+++ b/procps/watch.c
@@ -22,7 +22,7 @@
 //usage:       "[-n SEC] [-t] PROG ARGS"
 //usage:#define watch_full_usage "\n\n"
 //usage:       "Run PROG periodically\n"
-//usage:     "\n	-n SEC	Loop period (default 2)"
+//usage:     "\n	-n SEC	Period (default 2)"
 //usage:     "\n	-t	Don't print header"
 //usage:
 //usage:#define watch_example_usage