doc: clarify --help output for some optional arguments

* src/pr.c (usage): Fix the -S description to indicate
that the argument is optional for the short option.
* doc/coreutils.texi (pr invocation): Likewise.
* src/od.c (usage): Fix the -S description to indicate
that the argument is required for the short option.
Clarify -w takes an argument and that it is optional.

2 files changed, 4 insertions, 4 deletions

diff --git a/src/od.c b/src/od.c
index 2da282511..759379692 100644
--- a/src/od.c
+++ b/src/od.c
@@ -313,10 +313,10 @@ All arguments to long options are mandatory for short options.\n\
 "), stdout);
       fputs (_("\
   -N, --read-bytes=BYTES      limit dump to BYTES input bytes\n\
-  -S, --strings[=BYTES]       output strings of at least BYTES graphic chars\n\
+  -S BYTES, --strings[=BYTES]  output strings of at least BYTES graphic chars\n\
   -t, --format=TYPE           select output format or formats\n\
   -v, --output-duplicates     do not use * to mark line suppression\n\
-  -w, --width[=BYTES]         output BYTES bytes per output line\n\
+  -w[BYTES], --width[=BYTES]  output BYTES bytes per output line\n\
       --traditional           accept arguments in traditional form\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
diff --git a/src/pr.c b/src/pr.c
index 4f949de24..f1e310f90 100644
--- a/src/pr.c
+++ b/src/pr.c
@@ -250,7 +250,7 @@
                 compliant formulation. The source code translates -s into
                 the new options -S and -J, also -W if required.
 
-   -S STRING, --sep-string[=STRING]
+   -S[STRING], --sep-string[=STRING]
                 Separate columns by any string STRING. The -S option
                 doesn't react upon the -W/-w option (unlike -s option
                 does). It defines a separator nothing else.
@@ -2842,7 +2842,7 @@ Mandatory arguments to long options are mandatory for short options too.\n\
                     options (-COLUMN|-a -COLUMN|-m) except -w is set\n\
 "), stdout);
       fputs (_("\
-  -SSTRING, --sep-string[=STRING]\n\
+  -S[STRING], --sep-string[=STRING]\n\
                     separate columns by STRING,\n\
                     without -S: Default separator <TAB> with -J and <space>\n\
                     otherwise (same as -S\" \"), no effect on column options\n\