[clang-tidy] Document modernize-raw-string-literal check options

[PiotrZSL]

Summary

Add missing documentation for DelimiterStem and ReplaceShorterLiterals
options.

Fixes #54662

clang-tools-extra/docs/clang-tidy/checks/modernize/raw-string-literal.rst

 .. title:: clang-tidy - modernize-raw-string-literal
 
 modernize-raw-string-literal
 ============================
 
 This check selectively replaces string literals containing escaped characters
 with raw string literals.
 
 Example:
 
-.. code-blocK:: c++
+.. code-block:: c++
 
   const char *const Quotes{"embedded \"quotes\""};
   const char *const Paragraph{"Line one.\nLine two.\nLine three.\n"};
   const char *const SingleLine{"Single line.\n"};
   const char *const TrailingSpace{"Look here -> \n"};
   const char *const Tab{"One\tTwo\n"};
   const char *const Bell{"Hello!\a  And welcome!"};
   const char *const Path{"C:\\Program Files\\Vendor\\Application.exe"};

 A string literal containing only escaped newlines is a common way of
 writing lines of text output. Introducing physical newlines with raw
 string literals in this case is likely to impede readability. These
 string literals are left unchanged.
 
 An escaped horizontal tab, form feed, or vertical tab prevents the string
 literal from being converted. The presence of a horizontal tab, form feed or
 vertical tab in source code is not visually obvious.
+
+.. option:: DelimiterStem
+
+  Custom delimiter to escape characters in raw string literals. It is used in
+  the following construction: ``R"stem_delimiter(contents)stem_delimiter"``.
+  The default value is `lit`.
+
+.. option:: ReplaceShorterLiterals
+
+  Controls replacing shorter non-raw string literals with longer raw string
+  literals. Setting this option to `true` enables the replacement.
+  The default value is `false` (shorter literals are not replaced).