Fix description of '--pretty'.

src/compiler/commandLineParser.ts

@@ -154,7 +154,7 @@ namespace ts {
         {
             name: "pretty",
             paramType: Diagnostics.KIND,
-            description: Diagnostics.Stylize_errors_and_messages_using_colors_if_available_experimental,
+            description: Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental,
             type: "boolean"
         },
         {

src/compiler/diagnosticMessages.json

@@ -2285,8 +2285,8 @@
     "Suppress excess property checks for object literals.": {
         "category": "Message",
         "code": 6072
-    },
-    "Stylize errors and messages using colors if available. (experimental)": {
+    },
+    "Stylize errors and messages using color and context. (experimental)": {
         "category": "Message",
         "code": 6073
     },
@@ -2318,8 +2318,8 @@
     "Argument for '--jsx' must be 'preserve' or 'react'.": {
         "category": "Message",
         "code": 6081
-    },
-
+    },
+
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
         "code": 7005