Add an entry describing how to exit the REPL...

... in the #help text for csi/vbi.

src/Scripting/CSharpTest/CommandLineRunnerTests.cs

@@ -627,6 +627,7 @@ public void HelpCommand()
   Escape        Clear the current submission.
   UpArrow       Replace the current submission with a previous submission.
   DownArrow     Replace the current submission with a subsequent submission (after having previously navigated backwards).
+  Ctrl-C        Exit the REPL.
 REPL commands:
   #help         Display help on available commands and key bindings.
 Script directives:

src/Scripting/Core/ScriptingResources.Designer.cs

@@ -157,10 +157,10 @@ internal class ScriptingResources {
         ///  Escape        Clear the current submission.
         ///  UpArrow       Replace the current submission with a previous submission.
         ///  DownArrow     Replace the current submission with a subsequent submission (after having previously navigated backwards).
+        ///  Ctrl-C        Exit the REPL.
         ///REPL commands:
         ///  #help         Display help on available commands and key bindings.
-        ///Script directives:
-        ///  #r            Add a metad [rest of string was truncated]";.
+        ///Script directiv [rest of string was truncated]";.
         /// </summary>
         internal static string HelpText {
             get {

src/Scripting/Core/ScriptingResources.resx

@@ -155,6 +155,7 @@
   Escape        Clear the current submission.
   UpArrow       Replace the current submission with a previous submission.
   DownArrow     Replace the current submission with a subsequent submission (after having previously navigated backwards).
+  Ctrl-C        Exit the REPL.
 REPL commands:
   #help         Display help on available commands and key bindings.
 Script directives: