Verbatim interpolated strings: escape brace sequences are not interpreted literally (#5128)

Author: pkulikov

docs/csharp/language-reference/tokens/verbatim.md

@@ -23,7 +23,7 @@ The `@` special character serves as a verbatim identifier. It can be used in the
 
    [!code-csharp[verbatim1](../../../../samples/snippets/csharp/language-reference/keywords/verbatim1.cs#1)]
 
-1. To indicate that a string literal is to be interpreted verbatim. The `@` character in this instance defines a *verbatim string literal*. Simple escape sequences (such as `"\\"` for a backslash), hexadecimal escape sequences (such as `"\x0041"` for an uppercase A, and Unicode escape sequences, such as `"\u0041"` for an uppercase A, are interpreted literally. Only a quote escape sequence (`""`) is not interpreted literally; it produces a single quotation mark. The following example defines two identical file paths, one by using a regular string literal and the other by using a verbatim string literal. This is one of the more common uses of verbatim string literals.
+1. To indicate that a string literal is to be interpreted verbatim. The `@` character in this instance defines a *verbatim string literal*. Simple escape sequences (such as `"\\"` for a backslash), hexadecimal escape sequences (such as `"\x0041"` for an uppercase A), and Unicode escape sequences (such as `"\u0041"` for an uppercase A) are interpreted literally. Only a quote escape sequence (`""`) is not interpreted literally; it produces a single quotation mark. Additionally, in case of a verbatim [interpolated string](interpolated.md) brace escape sequences (`{{` and `}}`) are not interpreted literally; they produce single brace characters. The following example defines two identical file paths, one by using a regular string literal and the other by using a verbatim string literal. This is one of the more common uses of verbatim string literals.
 
    [!code-csharp[verbatim2](../../../../samples/snippets/csharp/language-reference/keywords/verbatim1.cs#2)]