Fixing document to reflect the current state

[kuqin12]

Preface

Please ensure you have read the contribution docs prior
to submitting the pull request. In particular,
pull request guidelines.

Description

There has been a few movements since the last documentation update:

1. The policy producers are centralized to a common module.
2. Added a new tool to read the applied configuration through the host OS.

For each item, place an "x" in between [ and ] if true. Example: [x].
(you can also check items in the GitHub UI)

• Impacts functionality?
  • Functionality - Does the change ultimately impact how firmware functions?
  • Examples: Add a new library, publish a new PPI, update an algorithm, ...
• Impacts security?
  • Security - Does the change have a direct security impact on an application,
    flow, or firmware?
  • Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
• Breaking change?
  • Breaking change - Will anyone consuming this change experience a break
    in build or boot behavior?
  • Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
• Includes tests?
  • Tests - Does the change include any explicit test code?
  • Examples: Unit tests, integration tests, robot tests, ...
• Includes documentation?
  • Documentation - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  • Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

This is just documentation updates.

Integration Instructions

N/A

[codecov-commenter]

Codecov Report

Merging #213 (fabe77e) into main (43c3cd2) will not change coverage.
The diff coverage is n/a.

❗ Current head fabe77e differs from pull request most recent head 1bedc83. Consider uploading reports for the commit 1bedc83 to get more accurate results

@@           Coverage Diff           @@
##             main     #213   +/-   ##
=======================================
  Coverage   27.74%   27.74%           
=======================================
  Files          16       16           
  Lines        4494     4494           
=======================================
  Hits         1247     1247           
  Misses       3247     3247           

Flag	Coverage Δ
Linux	27.74% <ø> (ø)

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