Rename to entrypoint to pybamm_parameter_sets

[awadell1]

Fixed a typo in docs on adding a new parameter set and added emphasis on installing/reinstalling the parameter set package.

Typo found via: #2452

[awadell1]

@tinosulzer Should be good to go

[codecov]

Codecov Report

Base: 99.72% // Head: 99.72% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (74bf311) compared to base (8bdc3e0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2475      +/-   ##
===========================================
- Coverage    99.72%   99.72%   -0.01%     
===========================================
  Files          258      257       -1     
  Lines        19264    18986     -278     
===========================================
- Hits         19211    18933     -278     
  Misses          53       53              

Impacted Files	Coverage Δ
pybamm/parameters/parameter_sets.py	100.00% <100.00%> (ø)
pybamm/models/base_model.py	98.48% <0.00%> (-0.05%)	⬇️
pybamm/util.py	100.00% <0.00%> (ø)
pybamm/expression_tree/functions.py	100.00% <0.00%> (ø)
...ybamm/expression_tree/operations/evaluate_julia.py

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[valentinsulzer]

I think parameter_sets should be plural, and the entry points code edited to allow that

[valentinsulzer]

Thanks!