[CPP-387] Remove duplicate FriendDecl entry.

docs/language/learn-ql/cpp/introduce-libraries-cpp.rst

@@ -148,9 +148,6 @@ This table lists `Declaration <https://help.semmle.com/qldoc/cpp/semmle/code/cpp
 +---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``enum`` *en* ``{`` *val1* ``,`` *val2* ... ``}``                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | `EnumConstant <https://help.semmle.com/qldoc/cpp/semmle/code/cpp/Enum.qll/type.Enum$EnumConstant.html>`__                                                             |                                                                                                                                                                                                    |
 +---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| | ``friend void`` *func* ``( int );```                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | `FriendDecl <https://help.semmle.com/qldoc/cpp/semmle/code/cpp/FriendDecl.qll/type.FriendDecl$FriendDecl.html>`__                                                     |                                                                                                                                                                                                    |
-| | ``friend class`` *B* ``;``                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                       |                                                                                                                                                                                                    |
-+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 
 
 Statement classes