[csc.exe cmd line - "response" file] Extra '-' character (#33544)

* [csc.exe cmd line "response" file] extra '-' character

When specifying a "response" (input) file for `csc.exe` with the `@` character, there mustn't be a dash in front

* Update miscellaneous.md

elaborate.

* Update miscellaneous.md

fidgeting

Author: glenn-slayden

docs/csharp/language-reference/compiler-options/miscellaneous.md

@@ -11,11 +11,11 @@ helpviewer_keywords:
 ---
 # Miscellaneous C# Compiler Options
 
-The following options control miscellaneous compiler behavior. The new MSBuild syntax is shown in **Bold**. The older *csc.exe* syntax is shown in `code style`.
+The following options control miscellaneous compiler behavior. The new MSBuild syntax is shown in **Bold**. The older *csc.exe* command-line syntax is shown in `code style`.
 
-- **ResponseFiles** / `-@`: Read response file for more options.
+- **ResponseFiles** / <code>@*CustomOpts.RSP*</code> : Read the specified response file for more options.
 - **NoLogo** / `-nologo` : Suppress compiler copyright message.
-- **NoConfig** / `-noconfig`: Don't auto include *CSC.RSP* file.
+- **NoConfig** / `-noconfig` : Don't auto include *CSC.RSP* file.
 
 ## ResponseFiles