test(testing): ignore doc test of snapshot docs (#6718)

Author: kt3k

testing/snapshot.ts

@@ -6,7 +6,7 @@
  * to a reference snapshot, which is stored alongside the test file in the
  * `__snapshots__` directory.
  *
- * ```ts
+ * ```ts ignore
  * // example_test.ts
  * import { assertSnapshot } from "@std/testing/snapshot";
  *
@@ -34,7 +34,7 @@
  * The `assertInlineSnapshot` function will create a snapshot of a value and compare it
  * to a reference snapshot, which is stored in the test file.
  *
- * ```ts
+ * ```ts ignore
  * // example_test.ts
  * import { assertInlineSnapshot } from "@std/testing/unstable-snapshot";
  *
@@ -99,8 +99,8 @@
  * The `assertSnapshot` and `assertInlineSnapshot` functions optionally accept an
  * options object.
  *
- * ```ts
- * // example_test.ts
+ * ```ts ignore
+ * // example_test.ts ignore
  * import { assertSnapshot } from "@std/testing/snapshot";
  *
  * Deno.test("isSnapshotMatch", async function (t): Promise<void> {
@@ -137,7 +137,7 @@
  * It is possible to "extend" an `assertSnapshot` or `assertInlineSnapshot` function which
  * has been configured with default options.
  *
- * ```ts
+ * ```ts ignore
  * // example_test.ts
  * import { createAssertSnapshot } from "@std/testing/snapshot";
  * import { stripAnsiCode } from "@std/fmt/colors";
@@ -507,7 +507,7 @@ class AssertSnapshotContext {
  * Type parameter can be specified to ensure values under comparison have the same type.
  *
  * @example Usage
- * ```ts
+ * ```ts ignore
  * import { assertSnapshot } from "@std/testing/snapshot";
  *
  * Deno.test("snapshot", async (t) => {
@@ -531,7 +531,7 @@ export async function assertSnapshot<T>(
  * Type parameter can be specified to ensure values under comparison have the same type.
  *
  * @example Usage
- * ```ts
+ * ```ts ignore
  * import { assertSnapshot } from "@std/testing/snapshot";
  *
  * Deno.test("snapshot", async (t) => {
@@ -613,7 +613,7 @@ export async function assertSnapshot(
  * The specified option becomes the default for returned {@linkcode assertSnapshot}
  *
  * @example Usage
- * ```ts
+ * ```ts ignore
  * import { createAssertSnapshot } from "@std/testing/snapshot";
  *
  * const assertSnapshot = createAssertSnapshot({