docs(python): add Error base class (#6315)

docs/src/api/class-error.md

@@ -0,0 +1,26 @@
+# class: Error
+* langs: python
+* extends: [Exception]
+
+Error is raised whenever certain operations are terminated abnormally, e.g.
+browser closes while [`method: Page.evaluate`] is running. All Playwright exceptions
+inherit from this class.
+
+- [error.message](./api/class-error.mdx#errormessage)
+- [error.name](./api/class-error.mdx#errorname)
+- [error.stack](./api/class-error.mdx#errorstack)
+
+## property: Error.message
+- returns: <[str]>
+
+Message of the error.
+
+## property: Error.name
+- returns: <[str]>
+
+Name of the error which got thrown inside the browser. Optional.
+
+## property: Error.stack
+- returns: <[str]>
+
+Stack of the error which got thrown inside the browser. Optional.

utils/doclint/documentation.js

@@ -68,7 +68,7 @@ class Documentation {
     for (const [name, clazz] of this.classes.entries()) {
       clazz.validateOrder(errors, clazz);
 
-      if (!clazz.extends || clazz.extends === 'EventEmitter' || clazz.extends === 'Error' || clazz.extends === 'RuntimeException')
+      if (!clazz.extends || ['EventEmitter', 'Error', 'Exception', 'RuntimeException'].includes(clazz.extends))
         continue;
       const superClass = this.classes.get(clazz.extends);
       if (!superClass) {