update manpage

docs/design/mono/mono-manpage-1.md

@@ -70,7 +70,7 @@ A number of diagnostic command line options take as argument a method
 description. A method description is a textual representation that can
 be used to uniquely identify a method. The syntax is as follows:
 
-    [namespace]classname:methodname[(arguments)]
+    [W:][namespace]classname:methodname[(arguments)]
 
 The values in brackets are optional, like the namespace and the
 arguments. The arguments themselves are either empty, or a
@@ -93,11 +93,18 @@ both a comma and a space and '\>'.
 
 By-reference arguments should include a "&" after the typename.
 
+If the method description is prefixed by 'W:' (or 'w:'), then it will
+match a *wrapper* method that may be created by the runtime for the
+specified method.  (For example imported P/Invoke methods may have a
+wrapper generated by the runtime.)
+
+
 Examples:
 
     *:ctor(int)		// All constructors that take an int as an argument
     *:Main			// Methods named Main in any class
     *:Main(string[])	// Methods named Main that take a string array in any class
+    W:UnixSignal:install  // Wrappers for the UnixSignal.install DllImport
 
 ## RUNTIME OPTIONS