Document verbatim interpolated strings using $@ and @$ syntax in F# (#48861)

Author: Copilot

docs/fsharp/language-reference/interpolated-strings.md

@@ -1,7 +1,7 @@
 ---
 title: Interpolated strings
 description: Learn about interpolated strings, a special form of string that allows you to embed F# expressions directly inside them.
-ms.date: 11/12/2020
+ms.date: 10/01/2025
 ---
 
 # Interpolated strings
@@ -13,6 +13,8 @@ Interpolated strings are [strings](strings.md) that allow you to embed F# expres
 ```fsharp
 $"string-text {expr}"
 $"string-text %format-specifier{expr}"
+$@"string-text {expr}"
+@$"string-text {expr}"
 $"""string-text {"embedded string literal"}"""
 $$"""string-text %%format-specifier{{expr}}"""
 ```
@@ -56,7 +58,29 @@ In the previous example, the code mistakenly passes the `age` value where `name`
 
 ## Verbatim interpolated strings
 
-F# supports verbatim interpolated strings with triple quotes so that you can embed string literals.
+F# supports verbatim interpolated strings in two ways:
+
+### Using `$@` or `@$` prefix
+
+You can combine the interpolation prefix `$` with the verbatim string prefix `@` in any order. Verbatim strings ignore escape sequences (except for `""` to represent a quotation mark) and can span multiple lines. This is especially useful when working with file paths or strings containing backslashes and quotes.
+
+```fsharp
+let name = "Alice"
+let path = @"C:\Users\Alice\Documents"
+
+// Using $@ prefix
+printfn $@"User {name} has files in: {path}"
+
+// Using @$ prefix (also valid)
+printfn @$"User {name} has files in: {path}"
+
+// Embedding quotes - use "" to represent a single "
+let message = $@"He said ""{name}"" is here"
+```
+
+### Using triple quotes
+
+F# also supports verbatim interpolated strings with triple quotes so that you can embed string literals without escaping.
 
 ```fsharp
 let age = 30

docs/fsharp/language-reference/snippets/interpolated-strings/verbatim.fsx

@@ -0,0 +1,19 @@
+// Verbatim interpolated strings with $@ or @$
+let name = "Alice"
+let path = @"C:\Users\Alice\Documents"
+
+// Using $@ prefix (interpolated verbatim string)
+printfn $@"User {name} has files in: {path}"
+
+// Using @$ prefix (also valid)
+printfn @$"User {name} has files in: {path}"
+
+// Embedding quotes without escaping
+let message = $@"He said ""{name}"" is here"
+printfn "%s" message
+
+// Multi-line verbatim interpolated strings
+let multiline = $@"Name: {name}
+Path: {path}
+Status: Active"
+printfn "%s" multiline