Update launch.json 'program' description

With the .NET CLI shared framework changes, 'program' should now be set to the built application dll in most cases. This updates the template and description.

Author: gregg-miskelly

package.json

@@ -172,8 +172,8 @@
             "properties": {
               "program": {
                 "type": "string",
-                "description": "Path to the program (executable file) to launch. On Windows, a '.exe' suffix is appended if not specified already.",
-                "default": "${workspaceRoot}/bin/Debug/<path-to-program>"
+                "description": "Path to the application dll or .NET Core host executable to launch. Example: '${workspaceRoot}/bin/Debug/<target-framework>/<project-name.dll>' where:\n<target-framework>: (example: 'netstandard1.5') This is the name of the framework that the app is being built for. It is set in the project.json file.\n<project-name>: (example: 'MyApp') The name of the project being debugged.",
+                "default": "${workspaceRoot}/bin/Debug/<target-framework>/<project-name.dll>"
               },
               "cwd": {
                 "type": "string",
@@ -345,7 +345,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceRoot}/bin/Debug/<path-to-program>",
+            "program": "${workspaceRoot}/bin/Debug/<target-framework>/<project-name.dll>",
             "args": [],
             "cwd": "${workspaceRoot}",
             "stopAtEntry": false
@@ -355,7 +355,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceRoot}/bin/Debug/<path-to-program>",
+            "program": "${workspaceRoot}/bin/Debug/<target-framework>/<project-name.dll>",
             "args": [],
             "cwd": "${workspaceRoot}",
             "stopAtEntry": false,