docs: update notation tsg doc link

[binbin-li]

Description

What this PR does / why we need it:

Update notation tsg doc link.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):

Fixes #1100

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm Chart Change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6a659b4) 52.24% compared to head (3a726ce) 52.39%.
Report is 1 commits behind head on main.

❗ Current head 3a726ce differs from pull request most recent head 65edec2. Consider uploading reports for the commit 65edec2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1152      +/-   ##
==========================================
+ Coverage   52.24%   52.39%   +0.15%     
==========================================
  Files          83      101      +18     
  Lines        5310     6344    +1034     
==========================================
+ Hits         2774     3324     +550     
- Misses       2284     2699     +415     
- Partials      252      321      +69     

Files	Coverage Δ
pkg/verifier/notation/notation.go	83.01% <100.00%> (ø)

... and 18 files with indirect coverage changes

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