Remove initialValue and edit description of default in ParamField (#916)

* Change mentions of introduction.mdx to index.mdx

* Remove initial value and edit description of default

Author: mycho2003

components/fields.mdx

@@ -31,7 +31,8 @@ The `<ParamField>` component is used to define parameters for your APIs or SDKs.
 
   Supports `number`, `string`, `boolean`, `object`.
 
-  Arrays can be defined using the `[]` suffix. For example, `string[]`.
+Arrays can be defined using the `[]` suffix. For example `string[]`.
+
 </ParamField>
 
 <ParamField body="required" type="boolean">
@@ -43,11 +44,7 @@ The `<ParamField>` component is used to define parameters for your APIs or SDKs.
 </ParamField>
 
 <ParamField body="default" type="string">
-  Default value used by the server if the request does not provide a value.
-</ParamField>
-
-<ParamField body="initialValue" type="any">
-  Value that will be used to initialize the playground.
+  Default value populated when the request value is empty
 </ParamField>
 
 <ParamField body="placeholder" type="string">