Update test after switch to GNATdoc for generics

Author: godunko

testsuite/ada_lsp/T713-012.completion.generic_package/test.json

@@ -276,7 +276,7 @@
                   "label": "Params of G",
                   "kind": 15,
                   "detail": "generic\n    type Elt_Type(<>) is limited private;\n    type Elt_Ptr is access all Elt_Type;\npackage G is\n    type T(Length: Natural) is private;\n    type T_Ptr is access all T;\nprivate\n    type Elt_Array is array(Positive range <>) of Elt_Ptr;\n    type T(Length: Natural) is\n\trecord\n\t    Elts: Elt_Array(1..Length);\n\tend record;\nend G;",
-                  "documentation": "at g.ads (3:1)\n\nSource:",
+                  "documentation": "at g.ads (3:1)\n\nSource:\n\n@formal Elt_Type\n@formal Elt_Ptr",
                   "sortText": "+0",
                   "insertText": "${1:Elt_Type : type Elt_Type(<>) is limited private;}, ${2:Elt_Ptr : type Elt_Ptr is access all Elt_Type;})$0",
                   "insertTextFormat": 2,
@@ -517,7 +517,7 @@
                   "label": "Params of G",
                   "kind": 15,
                   "detail": "generic\n    type Elt_Type(<>) is limited private;\n    type Elt_Ptr is access all Elt_Type;\npackage G is\n    type T(Length: Natural) is private;\n    type T_Ptr is access all T;\nprivate\n    type Elt_Array is array(Positive range <>) of Elt_Ptr;\n    type T(Length: Natural) is\n\trecord\n\t    Elts: Elt_Array(1..Length);\n\tend record;\nend G;",
-                  "documentation": "at g.ads (3:1)\n\nSource:",
+                  "documentation": "at g.ads (3:1)\n\nSource:\n\n@formal Elt_Type\n@formal Elt_Ptr",
                   "sortText": "+0",
                   "insertText": " Elt_Ptr => ${2:type Elt_Ptr is access all Elt_Type;})$0",
                   "insertTextFormat": 2,