cw: don't shadow pure pre-processing
cw(1onbld): --shadow not --secondary

@@ -49,11 +49,11 @@
 command lines.
 .Sh ARGUMENTS
 Both the
 .Fl -primary
 and
-.Fl -secondary
+.Fl -shadow
 parameters take a
 .Em compiler specification .
 This is a comma-separated list of the form
 .Ar name,executable,style
 Where

@@ -131,20 +131,15 @@
 .Nm cw
 will invoke shadow compiler, with the outputs modified (as well as any
 translation for compiler style) as follows:
 .Bl -enum
 .It
-If none of
+If neither of 
 .Fl c ,
-.Fl E ,
-.Fl P ,
-or
 .Fl S
-appears in the argument list (that is, linking is attempted), the shadow
-compilers will not be invoked.
-This is because the objects built with that compiler which would be linked
-have been previously discarded.
+appears in the argument list (that is, linking is attempted or only the
+pre-processor is invoked), the shadow compilers will not be invoked.
 .It
 If the
 .Fl o Ar filename
 option was provided, with or without a separating space, it will be replaced with
 .Fl o Ar tempfile

@@ -163,12 +158,11 @@
 Messages from the compilers will not be interleaved.
 If
 .Nm cw
 is used to invoke the preprocessor and no output location is specified,
 .Nm cw
-will write to standard output the primary compiler's standard output, and the
-secondary compiler's standard output will be discarded.
+will write to standard output the primary compiler's standard output.
 .Pp
 Because the Sun compilers write intermediate objects to fixed
 filenames in the current directory when instructed to compile and
 link multiple source files via a single command line, it would be
 unsafe to invoke more than one compiler in this fashion.