Revise the PR template

[kwankyu]

📚 Description

Made small edits to the PR template, making it concise and tidy overall.

📝 Checklist

• The title is concise, informative, and self-explanatory.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[tobiasdiez]

Thanks!

[tobiasdiez]

LGTM, thanks!

[kwankyu]

Thanks!

[codecov-commenter]

Codecov Report

Base: 88.59% // Head: 88.59% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (726a53d) compared to base (05329f6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35141      +/-   ##
===========================================
- Coverage    88.59%   88.59%   -0.01%     
===========================================
  Files         2140     2140              
  Lines       396998   396998              
===========================================
- Hits        351740   351706      -34     
- Misses       45258    45292      +34     

Impacted Files	Coverage Δ
src/sage/categories/super_modules_with_basis.py	96.29% <0.00%> (-3.71%)	⬇️
...e/combinat/cluster_algebra_quiver/mutation_type.py	52.25% <0.00%> (-2.38%)	⬇️
src/sage/modular/local_comp/liftings.py	98.33% <0.00%> (-1.67%)	⬇️
...rc/sage/categories/super_lie_conformal_algebras.py	95.00% <0.00%> (-1.67%)	⬇️
src/sage/modular/hecke/algebra.py	94.65% <0.00%> (-1.07%)	⬇️
src/sage/schemes/elliptic_curves/hom_velusqrt.py	94.09% <0.00%> (-0.79%)	⬇️
src/sage/groups/generic.py	88.34% <0.00%> (-0.68%)	⬇️
src/sage/schemes/elliptic_curves/hom.py	83.33% <0.00%> (-0.62%)	⬇️
src/sage/quadratic_forms/binary_qf.py	92.78% <0.00%> (-0.50%)	⬇️
src/sage/graphs/tutte_polynomial.py	93.57% <0.00%> (-0.46%)	⬇️
... and 17 more

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[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: eea03f2