[PR #8010/2670e7b0 backport][3.10] Fix the Towncrier philosophy link

[patchback]

This is a backport of PR #8010 as merged into master (2670e7b).

What do these changes do?

These changes fix a broken link to towncrier's philosophy.

Are there changes in behavior for the user?

Link from CHANGES/README.rst to towncrier's philosophy will be fixed.

Related issue number

Similar PR:

• Fix the Towncrier philosophy link frozenlist#574

Checklist

• I think the code is well written
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder

Best regards!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c465e85) 97.37% compared to head (6298767) 97.37%.
Report is 1 commits behind head on 3.10.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8040   +/-   ##
=======================================
  Coverage   97.37%   97.37%           
=======================================
  Files         108      108           
  Lines       32760    32760           
  Branches     3896     3896           
=======================================
  Hits        31901    31901           
  Misses        656      656           
  Partials      203      203           

Flag	Coverage Δ
CI-GHA	97.28% <ø> (ø)
OS-Linux	96.98% <ø> (ø)
OS-Windows	94.49% <ø> (ø)
OS-macOS	96.79% <ø> (-0.01%)	⬇️
Py-3.10.11	94.39% <ø> (-0.01%)	⬇️
Py-3.10.13	96.76% <ø> (+<0.01%)	⬆️
Py-3.11.7	96.52% <ø> (ø)
Py-3.12.1	?
Py-3.8.10	94.37% <ø> (ø)
Py-3.8.18	96.70% <ø> (ø)
Py-3.9.13	94.37% <ø> (-0.01%)	⬇️
Py-3.9.18	96.75% <ø> (ø)
Py-pypy7.3.15	96.29% <ø> (+<0.01%)	⬆️
VM-macos	96.79% <ø> (-0.01%)	⬇️
VM-ubuntu	96.98% <ø> (ø)
VM-windows	94.49% <ø> (ø)

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