docs: 安装通道文档优化，增加页面填写指引(closed #2051)

[chalice-canway]

PR

CheckList（PR Assigners）

确认已完成以下操作：

• [x] 已将分支与当前合入分支同步
• [x] 已在关联 Issue 中补充「功能自测」部分内容
• [x] 已更新关联 Issue 的状态 backlog -> todo -> for test -> tested（需通过测试同学测试） -> done
• [x] 将 PR 添加上 pr/reviewable

CheckList（PR Reviewers）

确认已完成以下操作：

• [ ] 检查关联 Issue 「功能自测」部分内容
• [ ] 必要时打回 pr/reviewable，要求重新修改
• [ ] 及时 Approve

[tencentblueking-adm]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.06326% with 215 lines in your changes are missing coverage. Please review.

Project coverage is 74.71%. Comparing base (f22e93e) to head (93d81b7). Report is 66 commits behind head on v2.4.4-dev.

Files	Patch %	Lines
apps/node_man/handlers/debug.py	8.69%	147 Missing :warning:
apps/node_man/periodic_tasks/sync_cmdb_host.py	58.62%	12 Missing :warning:
apps/backend/subscription/steps/adapter.py	84.90%	8 Missing :warning:
apps/core/concurrent/retry.py	71.42%	8 Missing :warning:
apps/core/gray/handlers.py	83.33%	5 Missing :warning:
apps/node_man/views/install_channel.py	63.63%	4 Missing :warning:
apps/node_man/handlers/cmdb.py	66.66%	3 Missing :warning:
...nents/collections/agent_new/install_other_agent.py	66.66%	2 Missing :warning:
...ckend/management/commands/init_official_plugins.py	91.66%	2 Missing :warning:
...ckend/subscription/steps/agent_adapter/handlers.py	91.66%	2 Missing :warning:
... and 16 more

Additional details and impacted files

@@              Coverage Diff               @@
##           v2.4.4-dev    #2100      +/-   ##
==============================================
+ Coverage       74.58%   74.71%   +0.13%     
==============================================
  Files             403      404       +1     
  Lines           27750    28266     +516     
==============================================
+ Hits            20697    21119     +422     
- Misses           7053     7147      +94     

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