tests: fix tooltip tests

tests/fixtures/hover/save_data/test_tooltip_mod_use_external.rs.0004_012.json

@@ -5,6 +5,12 @@
     "col": 12
   },
   "data": {
-    "Ok": []
+    "Ok": [
+      {
+        "language": "rust",
+        "value": "std/src/sync/mod.rs"
+      },
+      "Useful synchronization primitives.\n\n## The need for synchronization\n\nConceptually, a Rust program is a series of operations which will\nbe executed on a computer. The timeline of events happening in the\nprogram is consistent with the order of the operations in the code.\n\nConsider the following code, operating on some global static variables:\n\n```rust\nstatic mut A: u32 = 0;"
+    ]
   }
 }

tests/fixtures/hover/save_data/test_tooltip_mod_use_external.rs.0005_012.json

@@ -5,6 +5,12 @@
     "col": 12
   },
   "data": {
-    "Ok": []
+    "Ok": [
+      {
+        "language": "rust",
+        "value": "std/src/sync/mod.rs"
+      },
+      "Useful synchronization primitives.\n\n## The need for synchronization\n\nConceptually, a Rust program is a series of operations which will\nbe executed on a computer. The timeline of events happening in the\nprogram is consistent with the order of the operations in the code.\n\nConsider the following code, operating on some global static variables:\n\n```rust\nstatic mut A: u32 = 0;"
+    ]
   }
 }

tests/fixtures/hover/save_data/test_tooltip_std.rs.0015_017.json

@@ -11,7 +11,7 @@
         "value": "library/alloc/src/string.rs"
       },
       "https://doc.rust-lang.org/nightly/alloc/string/",
-      "A UTF-8 encoded, growable string.\n\nThis module contains the [`String`] type, a trait for converting\n[`ToString`]s, and several error types that may result from working with\n[`String`]s.\n\n# Examples\n\nThere are multiple ways to create a new [`String`] from a string literal:\n\n```rust\nlet s = \"Hello\".to_string();\n\nlet s = String::from(\"world\");\nlet s: String = \"also this\".into();\n```\n\nYou can create a new [`String`] from an existing one by concatenating with\n`+`:\n\n```rust\nlet s = \"Hello\".to_string();\n\nlet message = s + \" world!\";\n```\n\nIf you have a vector of valid UTF-8 bytes, you can make a [`String`] out of\nit. You can do the reverse too.\n\n```rust\nlet sparkle_heart = vec![240, 159, 146, 150];\n\n// We know these bytes are valid, so we'll use `unwrap()`.\nlet sparkle_heart = String::from_utf8(sparkle_heart).unwrap();\n\nassert_eq!(\"💖\", sparkle_heart);\n\nlet bytes = sparkle_heart.into_bytes();\n\nassert_eq!(bytes, [240, 159, 146, 150]);\n```"
+      "A UTF-8–encoded, growable string.\n\nThis module contains the [`String`] type, the [`ToString`] trait for\nconverting to strings, and several error types that may result from\nworking with [`String`]s.\n\n# Examples\n\nThere are multiple ways to create a new [`String`] from a string literal:\n\n```rust\nlet s = \"Hello\".to_string();\n\nlet s = String::from(\"world\");\nlet s: String = \"also this\".into();\n```\n\nYou can create a new [`String`] from an existing one by concatenating with\n`+`:\n\n```rust\nlet s = \"Hello\".to_string();\n\nlet message = s + \" world!\";\n```\n\nIf you have a vector of valid UTF-8 bytes, you can make a [`String`] out of\nit. You can do the reverse too.\n\n```rust\nlet sparkle_heart = vec![240, 159, 146, 150];\n\n// We know these bytes are valid, so we'll use `unwrap()`.\nlet sparkle_heart = String::from_utf8(sparkle_heart).unwrap();\n\nassert_eq!(\"💖\", sparkle_heart);\n\nlet bytes = sparkle_heart.into_bytes();\n\nassert_eq!(bytes, [240, 159, 146, 150]);\n```"
     ]
   }
 }