Remove ruby 2.7 rails 5.2 per the rules

Remove duplicate ruby 3.0 testing
Update documentation to read better

.github/workflows/test.yml

@@ -16,36 +16,35 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Latest ruby (3.3), will test
+        # Latest ruby will only be tested on
         # - all rails versions in current major
         # - latest rails version in the previous major
         #
-        # Unsupported rubies will test
-        # - rails versions in each branch if they are released within 6 months of EOL
-        # - nothing in the current rails major
+        # Any unsupported ruby will only be tested on
+        # - rails versions in each branch if their last release is within 6 months of the Ruby EOL date
+        # - Excluding any version of the current rails major
         #
         # 2.6 -> Unsupported from March '22 -> Only test up to Sep '22
         # 2.7 -> Unsupported from March '23 -> Only test up to Sep '23
         # 3.0 -> Unsupported from March '24 -> Only test up to Sep '24
         include:
           - { ruby: '2.6', gemfile: 'rails_5_2' }
-          - { ruby: '2.7', gemfile: 'rails_5_2' }
           - { ruby: '2.7', gemfile: 'rails_6_0' }
           - { ruby: '2.7', gemfile: 'rails_6_1' }
-          # Ruby 3+ won't work with Rails 5.2: https://github.com/rails/rails/issues/40938
           # Capybara has an incompatibility here with rails 6. It's easier to just exclude this one run from the matrix until it's out of support
-          # As such ruby 3.0 is only tested on rails 7.0 as an exception to the rule
+          # As such ruby 3.0 is only tested on rails 7.0 as an EXCEPTION to the above rules
           - { ruby: '3.0', gemfile: 'rails_7_0' }
           - { ruby: '3.3', gemfile: 'rails_6_1' }
           - { ruby: '3.3', gemfile: 'rails_7_0' }
           - { ruby: '3.3', gemfile: 'rails_7_1' }
           - { ruby: '3.3', gemfile: 'rails_7_2' }
         # Supported rubies will test all permissible supported rails versions
-        ruby: ['3.0', '3.1', '3.2']
+        ruby: ['3.1', '3.2']
         gemfile: ['rails_5_2', 'rails_6_0', 'rails_6_1', 'rails_7_0', 'rails_7_1', 'rails_7_2']
         exclude:
+            # Ruby 3.0+ won't work with Rails 5.2: https://github.com/rails/rails/issues/40938
+            # Ruby 3.1+ has a conflicting Psych version with Rails 6.x: https://stackoverflow.com/questions/71191685/visit-psych-nodes-alias-unknown-alias-default-psychbadalias
           - { ruby: '3.1', gemfile: 'rails_5_2' }
-          # Ruby 3.1+ has a conflicting Psych version with Rails 6.x: https://stackoverflow.com/questions/71191685/visit-psych-nodes-alias-unknown-alias-default-psychbadalias
           - { ruby: '3.1', gemfile: 'rails_6_0' }
           - { ruby: '3.1', gemfile: 'rails_6_1' }
           - { ruby: '3.2', gemfile: 'rails_5_2' }