Fix docstrings in mu.

@@ -24,7 +24,7 @@
 #include "mu.h"
 
 static char filter_doc[] = N_("mu filter");
-static char filter_args_doc[] = N_("[OPTIONS] NAME");
+static char filter_args_doc[] = N_("NAME");
 
 static struct argp_option filter_options[] = {
   { "encode", 'e', NULL, 0, N_("encode the input (default)") },

@@ -24,7 +24,7 @@
 #include "mu.h"
 
 static char flt2047_doc[] = N_("mu 2047 - decode/encode message headers");
-static char flt2047_args_doc[] = N_("[OPTIONS] [text]");
+static char flt2047_args_doc[] = N_("[text]");
 
 static struct argp_option flt2047_options[] = {
   { "encode", 'e', NULL, 0, N_("encode the input (default)") },

@@ -24,9 +24,9 @@
 #include "mu.h"
 
 static char info_doc[] = N_("mu info - print a list of configuration\
-options used to build mailutils; optional arguments are interpreted\
+ options used to build mailutils; optional arguments are interpreted\
  as a list of configuration options to check for.");
-static char info_args_doc[] = N_("[OPTIONS] [capa...]");
+static char info_args_doc[] = N_("[capa...]");
 
 static struct argp_option info_options[] = {
   { "verbose", 'v', NULL, 0,

@@ -25,7 +25,7 @@
 #include "mu.h"
 
 static char query_doc[] = N_("mu query - query configuration values.");
-static char query_args_doc[] = N_("[OPTIONS]");
+static char query_args_doc[] = N_("keyword [keyword...]");
 
 char *file_name;
 int verbose_option;