[PR #7348/bf9d753e backport][3.8] 🐛 Fix RST in changelog template before links

[patchback]

This is a backport of PR #7348 as merged into master (bf9d753).

In corner cases, changelog fragments with things like detached link definitions (example: #7346) cause RST rendering errors. This patch corrects this by injecting empty lines between the changelog entry bodies and their reference lists.

[codecov]

Codecov Report

Merging #7349 (dc13820) into 3.8 (9a41831) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.8    #7349      +/-   ##
==========================================
+ Coverage   97.30%   97.39%   +0.08%     
==========================================
  Files         107      107              
  Lines       30996    30996              
  Branches     3243     3924     +681     
==========================================
+ Hits        30161    30188      +27     
+ Misses        625      604      -21     
+ Partials      210      204       -6     

Flag	Coverage Δ
CI-GHA	97.25% <ø> (+0.07%)	⬆️
OS-Linux	96.91% <ø> (+0.06%)	⬆️
OS-Windows	95.23% <ø> (+0.39%)	⬆️
OS-macOS	96.64% <ø> (+0.30%)	⬆️
Py-3.10.11	94.84% <ø> (-0.01%)	⬇️
Py-3.10.12	96.54% <ø> (+0.05%)	⬆️
Py-3.11.0	96.21% <ø> (?)
Py-3.6.15	96.37% <ø> (+0.04%)	⬆️
Py-3.6.8	94.76% <ø> (?)
Py-3.7.17	96.53% <ø> (ø)
Py-3.7.9	94.89% <ø> (?)
Py-3.8.10	94.82% <ø> (?)
Py-3.8.17	96.44% <ø> (+0.12%)	⬆️
Py-3.9.13	94.81% <ø> (?)
Py-3.9.17	96.50% <ø> (+0.15%)	⬆️
Py-pypy7.3.11	93.95% <ø> (?)
VM-macos-latest	96.64% <ø> (+0.30%)	⬆️
VM-ubuntu-20.04	96.89% <ø> (+0.04%)	⬆️
VM-ubuntu-latest	96.44% <ø> (?)
VM-windows-latest	95.23% <ø> (+0.39%)	⬆️

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see 6 files with indirect coverage changes

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