rubocop: Drop "a" and "b" from Naming/MethodParameterName allowlist

Library/.rubocop.yml

@@ -189,8 +189,6 @@ Naming/MethodParameterName:
       - AllowedNames
   AllowedNames:
     [
-      "a",
-      "b",
       "o",
       "pr",
     ]

Library/Homebrew/upgrade.rb

@@ -423,13 +423,13 @@ module Homebrew
       end
     end
 
-    def depends_on(a, b)
-      if a.any_installed_keg
+    def depends_on(one, two)
+      if one.any_installed_keg
          &.runtime_dependencies
-         &.any? { |d| d["full_name"] == b.full_name }
+         &.any? { |dependency| dependency["full_name"] == two.full_name }
         1
       else
-        a <=> b
+        one <=> two
       end
     end
     private_class_method :depends_on

Library/Homebrew/version.rb

@@ -653,9 +653,9 @@ class Version
 
   private
 
-  sig { params(a: Integer, b: Integer).returns(Integer) }
-  def max(a, b)
-    (a > b) ? a : b
+  sig { params(first: Integer, second: Integer).returns(Integer) }
+  def max(first, second)
+    (first > second) ? first : second
   end
 
   sig { returns(T::Array[Token]) }