Remove incorrect message (google#729)

Remove incorrect message

Author: sparkprime

cmd/jsonnetfmt.cpp

@@ -43,7 +43,6 @@ void usage(std::ostream &o)
     version(o);
     o << "\n";
     o << "jsonnetfmt {<option>} { <filename> }\n";
-    o << "Note: Some options do not support multiple filenames\n";
     o << "\n";
     o << "Available options:\n";
     o << "  -h / --help             This message\n";

test_cmd/fmt_help.golden.stdout.cpp

@@ -1,7 +1,6 @@
 Jsonnet reformatter v0.14.0
 
 jsonnetfmt {<option>} { <filename> }
-Note: Some options do not support multiple filenames
 
 Available options:
   -h / --help             This message

test_cmd/fmt_no_args.golden.stderr

@@ -3,7 +3,6 @@ ERROR: must give filename
 Jsonnet reformatter v0.14.0
 
 jsonnetfmt {<option>} { <filename> }
-Note: Some options do not support multiple filenames
 
 Available options:
   -h / --help             This message