Remove HelpText for -fno-diagnostics-show-note-include-stack

The help text was wrong, and we already provide help text on the
option that actually changes anything, i.e. -fdiagnostics-show-note-include-stack.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186989 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 3e2fe4d..3e97b4b 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -584,7 +584,7 @@
 def fno_diagnostics_show_name : Flag<["-"], "fno-diagnostics-show-name">, Group<f_Group>;
 def fno_diagnostics_show_option : Flag<["-"], "fno-diagnostics-show-option">, Group<f_Group>;
 def fno_diagnostics_show_note_include_stack : Flag<["-"], "fno-diagnostics-show-note-include-stack">,
-    Flags<[CC1Option]>, Group<f_Group>, HelpText<"Display include stacks for diagnostic notes">;
+    Flags<[CC1Option]>, Group<f_Group>;
 def fno_dollars_in_identifiers : Flag<["-"], "fno-dollars-in-identifiers">, Group<f_Group>,
   HelpText<"Disallow '$' in identifiers">, Flags<[CC1Option]>;
 def fno_elide_constructors : Flag<["-"], "fno-elide-constructors">, Group<f_Group>,