[docs] Remove Compatibilities from ECS examples

[t-kikuc]

What this PR does:

as title

Why we need it:

Compatibilities cannot be used because RegisterTaskDefinitionInput does not have it.
It's confusing for users.

cf.

• https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/ecs@v1.46.2#RegisterTaskDefinitionInput
• Although types.TaskDefinition has it, we cannot pass it when registering.
  

  pipecd/pkg/app/piped/platformprovider/ecs/client.go

  Lines 180 to 195 in ad3c877

  	func (c *client) RegisterTaskDefinition(ctx context.Context, taskDefinition types.TaskDefinition) (*types.TaskDefinition, error) {
  	input := &ecs.RegisterTaskDefinitionInput{
  	Family: taskDefinition.Family,
  	ContainerDefinitions: taskDefinition.ContainerDefinitions,
  	RequiresCompatibilities: taskDefinition.RequiresCompatibilities,
  	ExecutionRoleArn: taskDefinition.ExecutionRoleArn,
  	TaskRoleArn: taskDefinition.TaskRoleArn,
  	NetworkMode: taskDefinition.NetworkMode,
  	Volumes: taskDefinition.Volumes,
  	RuntimePlatform: taskDefinition.RuntimePlatform,
  	EphemeralStorage: taskDefinition.EphemeralStorage,
  	// Requires defined at task level in case Fargate is used.
  	Cpu: taskDefinition.Cpu,
  	Memory: taskDefinition.Memory,
  	// TODO: Support tags for registering task definition.
  	}

Which issue(s) this PR fixes:

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[Warashi]

👍🏻

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.16%. Comparing base (ad3c877) to head (2fdaa53).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5301      +/-   ##
==========================================
+ Coverage   25.14%   25.16%   +0.01%     
==========================================
  Files         449      449              
  Lines       47642    47642              
==========================================
+ Hits        11980    11988       +8     
+ Misses      34717    34708       -9     
- Partials      945      946       +1     

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[ffjlabo]

LGTM 👍 I didn't know that