fix(transcoder): update the API

#### transcoder:v1

The following keys were changed:
- schemas.Image.description
- schemas.Image.properties.uri.description
- schemas.Manifest.properties.type.description
- schemas.Manifest.properties.type.enumDescriptions

Author: yoshi-automation

discovery/transcoder-v1.json

@@ -385,7 +385,7 @@
       }
     }
   },
-  "revision": "20230322",
+  "revision": "20230426",
   "rootUrl": "https://transcoder.googleapis.com/",
   "schemas": {
     "AdBreak": {
@@ -950,7 +950,7 @@
       "type": "object"
     },
     "Image": {
-      "description": "Overlaid jpeg image.",
+      "description": "Overlaid image.",
       "id": "Image",
       "properties": {
         "alpha": {
@@ -963,7 +963,7 @@
           "description": "Normalized image resolution, based on output video resolution. Valid values: `0.0`–`1.0`. To respect the original image aspect ratio, set either `x` or `y` to `0.0`. To use the original image resolution, set both `x` and `y` to `0.0`."
         },
         "uri": {
-          "description": "Required. URI of the JPEG image in Cloud Storage. For example, `gs://bucket/inputs/image.jpeg`. JPEG is the only supported image type.",
+          "description": "Required. URI of the image in Cloud Storage. For example, `gs://bucket/inputs/image.png`. Only PNG and JPEG images are supported.",
           "type": "string"
         }
       },
@@ -1242,16 +1242,16 @@
           "type": "array"
         },
         "type": {
-          "description": "Required. Type of the manifest, can be `HLS` or `DASH`.",
+          "description": "Required. Type of the manifest.",
           "enum": [
             "MANIFEST_TYPE_UNSPECIFIED",
             "HLS",
             "DASH"
           ],
           "enumDescriptions": [
             "The manifest type is not specified.",
-            "Create `HLS` manifest. The corresponding file extension is `.m3u8`.",
-            "Create `DASH` manifest. The corresponding file extension is `.mpd`."
+            "Create an HLS manifest. The corresponding file extension is `.m3u8`.",
+            "Create an MPEG-DASH manifest. The corresponding file extension is `.mpd`."
           ],
           "type": "string"
         }

src/apis/transcoder/v1.ts

@@ -583,7 +583,7 @@ export namespace transcoder_v1 {
     widthPixels?: number | null;
   }
   /**
-   * Overlaid jpeg image.
+   * Overlaid image.
    */
   export interface Schema$Image {
     /**
@@ -595,7 +595,7 @@ export namespace transcoder_v1 {
      */
     resolution?: Schema$NormalizedCoordinate;
     /**
-     * Required. URI of the JPEG image in Cloud Storage. For example, `gs://bucket/inputs/image.jpeg`. JPEG is the only supported image type.
+     * Required. URI of the image in Cloud Storage. For example, `gs://bucket/inputs/image.png`. Only PNG and JPEG images are supported.
      */
     uri?: string | null;
   }
@@ -782,7 +782,7 @@ export namespace transcoder_v1 {
      */
     muxStreams?: string[] | null;
     /**
-     * Required. Type of the manifest, can be `HLS` or `DASH`.
+     * Required. Type of the manifest.
      */
     type?: string | null;
   }