docs(ecs): update docs on cpu and memory limits (#22209)

Added a document to expand the cpu to 16vcpu and memory to 120GB that can be set in fargate.

- Reference URL
    - https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-cpu-memory-error.html
    - https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-resource-ecs-taskdefinition.html#cfn-ecs-taskdefinition-cpu
    - https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-resource-ecs-taskdefinition.html#cfn-ecs-taskdefinition-memory


----

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### New Features

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packages/@aws-cdk/aws-ecs/lib/base/task-definition.ts

@@ -149,6 +149,10 @@ export interface TaskDefinitionProps extends CommonTaskDefinitionProps {
    *
    * 4096 (4 vCPU) - Available memory values: Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB)
    *
+   * 8192 (8 vCPU) - Available memory values: Between 16384 (16 GB) and 61440 (60 GB) in increments of 4096 (4 GB)
+   *
+   * 16384 (16 vCPU) - Available memory values: Between 32768 (32 GB) and 122880 (120 GB) in increments of 8192 (8 GB)
+   *
    * @default - CPU units are not specified.
    */
   readonly cpu?: string;
@@ -170,6 +174,10 @@ export interface TaskDefinitionProps extends CommonTaskDefinitionProps {
    *
    * Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB) - Available cpu values: 4096 (4 vCPU)
    *
+   * Between 16384 (16 GB) and 61440 (60 GB) in increments of 4096 (4 GB) - Available cpu values: 8192 (8 vCPU)
+   *
+   * Between 32768 (32 GB) and 122880 (120 GB) in increments of 8192 (8 GB) - Available cpu values: 16384 (16 vCPU)
+   *
    * @default - Memory used by task is not specified.
    */
   readonly memoryMiB?: string;

packages/@aws-cdk/aws-ecs/lib/fargate/fargate-task-definition.ts

@@ -30,6 +30,10 @@ export interface FargateTaskDefinitionProps extends CommonTaskDefinitionProps {
    *
    * 4096 (4 vCPU) - Available memory values: Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB)
    *
+   * 8192 (8 vCPU) - Available memory values: Between 16384 (16 GB) and 61440 (60 GB) in increments of 4096 (4 GB)
+   *
+   * 16384 (16 vCPU) - Available memory values: Between 32768 (32 GB) and 122880 (120 GB) in increments of 8192 (8 GB)
+   *
    * @default 256
    */
   readonly cpu?: number;
@@ -48,6 +52,10 @@ export interface FargateTaskDefinitionProps extends CommonTaskDefinitionProps {
    *
    * Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB) - Available cpu values: 4096 (4 vCPU)
    *
+   * Between 16384 (16 GB) and 61440 (60 GB) in increments of 4096 (4 GB) - Available cpu values: 8192 (8 vCPU)
+   *
+   * Between 32768 (32 GB) and 122880 (120 GB) in increments of 8192 (8 GB) - Available cpu values: 16384 (16 vCPU)
+   *
    * @default 512
    */
   readonly memoryLimitMiB?: number;