Update release branch naming instructions

[rwedge]

Updating the release instructions so that the release branches do not use the names the release tags do

Updates the regex pattern for release branches in the release notes update check

[codecov]

Codecov Report

Merging #1345 (4d9269f) into main (6f7cead) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1345      +/-   ##
==========================================
+ Coverage   98.38%   98.58%   +0.19%     
==========================================
  Files         135      135              
  Lines       14496    14541      +45     
==========================================
+ Hits        14262    14335      +73     
+ Misses        234      206      -28     

Impacted Files	Coverage Δ
featuretools/computational_backends/utils.py	95.54% <ø> (ø)
...mputational_backend/test_feature_set_calculator.py	100.00% <ø> (+0.36%)	⬆️
...uretools/tests/entityset_tests/test_es_metadata.py	100.00% <ø> (+0.59%)	⬆️
...eaturetools/tests/entityset_tests/test_plotting.py	100.00% <ø> (+1.63%)	⬆️
...ols/tests/synthesis/test_deep_feature_synthesis.py	99.29% <ø> (+0.13%)	⬆️
featuretools/utils/plot_utils.py	92.00% <ø> (ø)
featuretools/__init__.py	84.21% <100.00%> (+1.35%)	⬆️
...s/computational_backends/feature_set_calculator.py	98.70% <100.00%> (+0.01%)	⬆️
featuretools/entityset/entityset.py	98.77% <100.00%> (+0.81%)	⬆️
featuretools/primitives/utils.py	99.20% <100.00%> (+0.09%)	⬆️
... and 10 more

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[gsheni]

lgtm