[docs] --save-temps=: add single quotes after #80921 and update --save-temps

Author: MaskRay

clang/include/clang/Driver/Options.td

@@ -5392,13 +5392,13 @@ def regcall4 : Flag<["-"], "regcall4">, Group<m_Group>,
   MarshallingInfoFlag<LangOpts<"RegCall4">>;
 def save_temps_EQ : Joined<["-", "--"], "save-temps=">, Flags<[NoXarchOption]>,
   Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
-  HelpText<"Save intermediate compilation results. <arg> can be set to cwd for "
-  "current working directory, or obj which will save temporary files in the "
+  HelpText<"Save intermediate compilation results. <arg> can be set to 'cwd' for "
+  "current working directory, or 'obj' which will save temporary files in the "
   "same directory as the final output file">;
 def save_temps : Flag<["-", "--"], "save-temps">, Flags<[NoXarchOption]>,
   Visibility<[ClangOption, FlangOption, FC1Option]>,
   Alias<save_temps_EQ>, AliasArgs<["cwd"]>,
-  HelpText<"Save intermediate compilation results">;
+  HelpText<"Alias for --save-temps=cwd">;
 def save_stats_EQ : Joined<["-", "--"], "save-stats=">, Flags<[NoXarchOption]>,
   HelpText<"Save llvm statistics.">;
 def save_stats : Flag<["-", "--"], "save-stats">, Flags<[NoXarchOption]>,