docs(http): move examples to @usageNotes (#26039)

PR Close #26039

packages/http/src/backends/xhr_backend.ts

@@ -209,6 +209,7 @@ export class CookieXSRFStrategy implements XSRFStrategy {
  * overridden if a different backend implementation should be used,
  * such as in a node backend.
  *
+ * @usageNotes
  * ### Example
  *
  * ```

packages/http/src/base_response_options.ts

@@ -26,6 +26,7 @@ import {ResponseOptionsArgs} from './interfaces';
  * This class may be used in tests to build {@link Response Responses} for
  * mock responses (see {@link MockBackend}).
  *
+ * @usageNotes
  * ### Example
  *
  * ```typescript
@@ -84,6 +85,7 @@ export class ResponseOptions {
    * This may be useful when sharing a base `ResponseOptions` object inside tests,
    * where certain properties may change from test to test.
    *
+   * @usageNotes
    * ### Example
    *
    * ```typescript
@@ -123,6 +125,7 @@ export class ResponseOptions {
  * when configuring an {@link Injector}, in order to override the default options
  * used by {@link Http} to create {@link Response Responses}.
  *
+ * @usageNotes
  * ### Example
  *
  * ```typescript

packages/http/src/headers.ts

@@ -13,6 +13,7 @@
  * The only known difference between this `Headers` implementation and the spec is the
  * lack of an `entries` method.
  *
+ * @usageNotes
  * ### Example
  *
  * ```

packages/http/src/http.ts

@@ -47,6 +47,7 @@ function mergeOptions(
  * `request` returns an `Observable` which will emit a single {@link Response} when a
  * response is received.
  *
+ * @usageNotes
  * ### Example
  *
  * ```typescript

packages/http/src/static_response.ts

@@ -21,6 +21,7 @@ import {Headers} from './headers';
  * usually instantiated by end-users, it is the primary object interacted with when it comes time to
  * add data to a view.
  *
+ * @usageNotes
  * ### Example
  *
  * ```

packages/http/src/url_search_params.ts

@@ -25,9 +25,9 @@ function paramParser(rawParams: string = ''): Map<string, string[]> {
  * @deprecated see https://angular.io/guide/http
  **/
 export class QueryEncoder {
-  encodeKey(k: string): string { return standardEncoding(k); }
+  encodeKey(key: string): string { return standardEncoding(key); }
 
-  encodeValue(v: string): string { return standardEncoding(v); }
+  encodeValue(value: string): string { return standardEncoding(value); }
 }
 
 function standardEncoding(v: string): string {