chore: check class @example blocks in check_docs

_tools/check_docs.ts

@@ -270,9 +270,7 @@ function assertClassDocs(document: DocNodeWithJsDoc<DocNodeClass>) {
   for (const typeParam of document.classDef.typeParams) {
     assertHasTypeParamTags(document, typeParam.name);
   }
-  if (!document.jsDoc.tags?.some((tag) => tag.kind === "example")) {
-    assertHasExampleTag(document);
-  }
+  assertHasExampleTag(document);
 
   for (const property of document.classDef.properties) {
     if (property.jsDoc === undefined) continue; // this is caught by `deno doc --lint`

async/unstable_semaphore.ts

@@ -13,7 +13,7 @@ interface Node {
  * @experimental **UNSTABLE**: New API, yet to be vetted.
  *
  * @example Usage
- * ```ts
+ * ```ts no-assert
  * import { Semaphore } from "@std/async/unstable-semaphore";
  *
  * const sem = new Semaphore(2);

cli/unstable_progress_bar.ts

@@ -159,6 +159,7 @@ function clamp(value: number, min: number, max: number) {
  * }
  *
  * await bar.stop();
+ * ```
  */
 export class ProgressBar {
   /**

internal/assertion_state.ts

@@ -5,7 +5,7 @@
  * Check the test suite internal state
  *
  * @example Usage
- * ```ts
+ * ```ts no-assert
  * import { AssertionState } from "@std/internal";
  *
  * const assertionState = new AssertionState();

streams/unstable_capped_delimiter_stream.ts

@@ -58,7 +58,7 @@ export interface CappedDelimiterOptions {
  * intermediate chunks instead of waiting for the entire message or risking
  * excessive memory usage.
  *
- * @example
+ * @example Usage
  * ```ts
  * import { assertEquals } from "@std/assert";
  * import {