Fix the documentation urls of alias related APIs

[gaobinlong]

Description

After this documentation PR is merged, we now have the official documentation for the Create or Update alias API, we need to correct the documentation url in this repo.

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[github-actions]

Changes Analysis

Commit SHA: 225f87e
Comparing To SHA: 592b9b6

API Changes

Summary

└─┬Paths
  ├─┬/_aliases
  │ └─┬POST
  │   └─┬External Docs
  │     └──[🔀] url (176:14)
  ├─┬/_aliases/{name}
  │ ├─┬PUT
  │ │ └─┬External Docs
  │ │   └──[🔀] url (220:14)
  │ └─┬POST
  │   └─┬External Docs
  │     └──[🔀] url (198:14)
  ├─┬/_alias/{name}
  │ ├─┬PUT
  │ │ └─┬External Docs
  │ │   └──[🔀] url (153:14)
  │ └─┬POST
  │   └─┬External Docs
  │     └──[🔀] url (131:14)
  ├─┬/{index}/_aliases
  │ └─┬PUT
  │   └─┬External Docs
  │     └──[🔀] url (7934:14)
  ├─┬/{index}/_alias/{name}
  │ ├─┬PUT
  │ │ └─┬External Docs
  │ │   └──[🔀] url (7910:14)
  │ └─┬POST
  │   └─┬External Docs
  │     └──[🔀] url (7887:14)
  ├─┬/{index}/_aliases/{name}
  │ ├─┬PUT
  │ │ └─┬External Docs
  │ │   └──[🔀] url (8001:14)
  │ └─┬POST
  │   └─┬External Docs
  │     └──[🔀] url (7978:14)
  ├─┬/_alias
  │ └─┬PUT
  │   └─┬External Docs
  │     └──[🔀] url (67:14)
  └─┬/{index}/_alias
    └─┬PUT
      └─┬External Docs
        └──[🔀] url (7799:14)

Document Element	Total Changes	Breaking Changes
paths	12	0

• Total Changes: 12
• Modifications: 12

Report

The full API changes report is available at: https://github.com/opensearch-project/opensearch-api-specification/actions/runs/10070706398/artifacts/1733434950

API Coverage

	Before	After	Δ
Covered (%)	490 (47.99 %)	490 (47.99 %)	0 (0 %)
Uncovered (%)	531 (52.01 %)	531 (52.01 %)	0 (0 %)
Unknown	24	24	0

[github-actions]

Spec Test Coverage Analysis

Total	Tested
514	114 (22.18 %)

[dblock]

We can skip CHANGELOG but feel free to update that even for small fixes.