Fix docs tests

Author: bheylin

src/raw.rs

@@ -256,13 +256,10 @@ impl RawValue {
     /// ```
     /// # use serde_json::json;
     /// #
-    /// let v = json!({ "a": null, "b": false });
-    /// let v = serde_json::value::to_raw_value(v).unwrap();
+    /// let val= json!(null);
+    /// let val = serde_json::value::to_raw_value(&val).unwrap();
     ///
-    /// assert!(v["a"].is_null());
-    ///
-    /// // The boolean `false` is not null.
-    /// assert!(!v["b"].is_null());
+    /// assert!(val.is_null());
     /// ```
     pub fn is_null(&self) -> bool {
         matches!(self.kind(), RawKind::Null)
@@ -273,13 +270,10 @@ impl RawValue {
     /// ```
     /// # use serde_json::json;
     /// #
-    /// let v = json!({ "a": false, "b": "false" });
-    /// let v = serde_json::value::to_raw_value(v).unwrap();
-    ///
-    /// assert!(v["a"].is_boolean());
+    /// let val = json!(true);
+    /// let val = serde_json::value::to_raw_value(&val).unwrap();
     ///
-    /// // The string `"false"` is a string, not a boolean.
-    /// assert!(!v["b"].is_boolean());
+    /// assert!(val.is_boolean());
     /// ```
     pub fn is_boolean(&self) -> bool {
         matches!(self.kind(), RawKind::Bool)
@@ -290,13 +284,10 @@ impl RawValue {
     /// ```
     /// # use serde_json::json;
     /// #
-    /// let v = json!({ "a": 1, "b": "2" });
-    /// let v = serde_json::value::to_raw_value(v).unwrap();
-    ///
-    /// assert!(v["a"].is_number());
+    /// let val = json!(101);
+    /// let val = serde_json::value::to_raw_value(&val).unwrap();
     ///
-    /// // The string `"2"` is a string, not a number.
-    /// assert!(!v["b"].is_number());
+    /// assert!(val.is_number());
     /// ```
     pub fn is_number(&self) -> bool {
         matches!(self.kind(), RawKind::Number)
@@ -307,13 +298,10 @@ impl RawValue {
     /// ```
     /// # use serde_json::json;
     /// #
-    /// let v = json!({ "a": "some string", "b": false });
-    /// let v = serde_json::value::to_raw_value(v).unwrap();
+    /// let val = json!("some string");
+    /// let val = serde_json::value::to_raw_value(&val).unwrap();
     ///
-    /// assert!(v["a"].is_string());
-    ///
-    /// // The boolean `false` is not a string.
-    /// assert!(!v["b"].is_string());
+    /// assert!(val.is_string());
     /// ```
     pub fn is_string(&self) -> bool {
         matches!(self.kind(), RawKind::String)
@@ -324,13 +312,10 @@ impl RawValue {
     /// ```
     /// # use serde_json::json;
     /// #
-    /// let obj = json!({ "a": ["an", "array"], "b": { "an": "object" } });
-    /// let obj = serde_json::value::to_raw_value(obj).unwrap();
-    ///
-    /// assert!(obj["a"].is_array());
+    /// let val = json!(["an", "array"]);
+    /// let val = serde_json::value::to_raw_value(&val).unwrap();
     ///
-    /// // an object, not an array
-    /// assert!(!obj["b"].is_array());
+    /// assert!(val.is_array());
     /// ```
     pub fn is_array(&self) -> bool {
         matches!(self.kind(), RawKind::Array)
@@ -341,14 +326,10 @@ impl RawValue {
     /// ```
     /// # use serde_json::json;
     /// #
-    /// let obj = json!({ "a": { "nested": true }, "b": ["an", "array"] });
-    /// let obj = serde_json::value::to_raw_value(obj).unwrap();
-    ///
-    /// assert!(obj.is_object());
-    /// assert!(obj["a"].is_object());
+    /// let val = json!({ "a": { "nested": true }, "b": ["an", "array"] });
+    /// let val = serde_json::value::to_raw_value(&val).unwrap();
     ///
-    /// // array, not an object
-    /// assert!(!obj["b"].is_object());
+    /// assert!(val.is_object());
     /// ```
     pub fn is_object(&self) -> bool {
         matches!(self.kind(), RawKind::Object)