[docs] Fix documentation for bugprone-dangling-handle

string_view isn't experimental anymore.
This check has always handled both forms.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D102313

clang-tools-extra/docs/clang-tidy/checks/bugprone-dangling-handle.rst

@@ -3,8 +3,7 @@
 bugprone-dangling-handle
 ========================
 
-Detect dangling references in value handles like
-``std::experimental::string_view``.
+Detect dangling references in value handles like ``std::string_view``.
 These dangling references can be a result of constructing handles from temporary
 values, where the temporary is destroyed soon after the handle is created.
 
@@ -35,4 +34,5 @@ Options
 .. option:: HandleClasses
 
    A semicolon-separated list of class names that should be treated as handles.
-   By default only ``std::experimental::basic_string_view`` is considered.
+   By default only ``std::basic_string_view`` and
+   ``std::experimental::basic_string_view`` are considered.