Refresh the commit access policy DOC

[sylvestre]

Just refreshing a bit the content cc @globau

[sylvestre]

@stevejalim I would like @globau to double check if you don't mind :)

[stevejalim]

@sylvestre @globau I've amended this PR based on the comments from @globau

Shall I merge this to main now, or does it need further review?

[codecov[bot]]

Codecov Report

Base: 77.45% // Head: 77.35% // Decreases project coverage by -0.09% :warning:

Coverage data is based on head (b3cc3d6) compared to base (851b333). Patch coverage: 80.95% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12113      +/-   ##
==========================================
- Coverage   77.45%   77.35%   -0.10%     
==========================================
  Files         147      147              
  Lines        7757     7747      -10     
==========================================
- Hits         6008     5993      -15     
- Misses       1749     1754       +5     

Impacted Files	Coverage Δ
bedrock/base/middleware.py	61.53% <0.00%> (ø)
bedrock/firefox/forms.py	94.11% <ø> (-0.89%)	:arrow_down:
bedrock/firefox/urls.py	95.45% <ø> (ø)
bedrock/newsletter/views.py	84.58% <0.00%> (-1.99%)	:arrow_down:
bedrock/privacy/urls.py	100.00% <ø> (ø)
bedrock/firefox/templatetags/helpers.py	93.75% <82.35%> (-1.36%)	:arrow_down:
bedrock/firefox/views.py	91.94% <100.00%> (+<0.01%)	:arrow_up:
bedrock/settings/base.py	93.94% <100.00%> (+0.05%)	:arrow_up:

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