docs: add more secret information to the admin api

[HuanXin-Chen]

Description

Due to changes in this two pull requests, it is necessary to synchronize the latest information to the relevant documentation of the admin API.

• feat: support aws secret manager #11417
• feat: support gcp secret manager #11436

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[shreemaan-abhishek]

The example column seems redundant. I would suggest using the following table instead:

Suggested change

	| Parameter | Required | Type | Description | Example |
	| --- | --- | --- | --- | --- |
	| access_key_id | True | string | AWS Access Key ID | |
	| secret_access_key | True | string | AWS Secret Access Key | |
	| session_token | False | string | Temporary access credential information | |
	| region | False | string | AWS Region | |
	| endpoint_url | False | URI | AWS Secret Manager URL | https://secretsmanager.{region}.amazonaws.com |
	| Parameter | Required | Type | Description |
	| ----------------- | -------- | ------ | --------------------------------------------------------------------------- |
	| access_key_id | True | string | AWS Access Key ID |
	| secret_access_key | True | string | AWS Secret Access Key |
	| session_token | False | string | Temporary access credential information |
	| region | False | string | AWS Region |
	| endpoint_url | False | URI | AWS Secret Manager URL (e.g: https://secretsmanager.{region}.amazonaws.com) |

[HuanXin-Chen]

I think there is no need to remove the example field, as the vault document also contains this field, and docs consistency should be maintained.

[shreemaan-abhishek]

sure, fine by me. I wanted it to be removed because it's a very wide almost empty column taking screen real estate away from other columns :D

[HuanXin-Chen]

Fixed.