fix schema doc tests

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

Author: anakrish

src/engine.rs

@@ -510,10 +510,11 @@ impl Engine {
     /// engine.enable_type_checking();
     ///
     /// // Set input schema
+    /// # #[cfg(feature = "jsonschema")]
     /// if let Some(checker) = engine.get_type_checker_mut() {
     ///     let schema = Schema::from_json_str(
     ///         r#"{"type": "object", "properties": {"value": {"type": "integer"}}}"#
-    ///     )?;
+    ///     ).map_err(|e| anyhow::anyhow!("{e}"))?;
     ///     checker.set_input_schema(schema);
     /// }
     ///

src/schema.rs

@@ -214,6 +214,7 @@ pub mod validate;
 /// Schemas are typically created by deserializing from JSON Schema format:
 ///
 /// ```rust
+/// use regorus::schema::Schema;
 /// use serde_json::json;
 ///
 /// // Create a schema from JSON
@@ -253,12 +254,16 @@ pub mod validate;
 ///
 /// ## Simple String Schema
 /// ```rust
+/// # use regorus::schema::Schema;
+/// # use serde_json::json;
 /// let schema = json!({ "type": "string", "minLength": 1 });
 /// let parsed: Schema = serde_json::from_value(schema).unwrap();
 /// ```
 ///
 /// ## Complex Object Schema
 /// ```rust
+/// # use regorus::schema::Schema;
+/// # use serde_json::json;
 /// let schema = json!({
 ///     "type": "object",
 ///     "properties": {
@@ -280,6 +285,8 @@ pub mod validate;
 ///
 /// ## Union Types with anyOf
 /// ```rust
+/// # use regorus::schema::Schema;
+/// # use serde_json::json;
 /// let schema = json!({
 ///     "anyOf": [
 ///         { "type": "string" },