Move `command_help_lines` into `Help` module.

Library/Homebrew/help.rb

@@ -100,6 +100,14 @@ module Homebrew
       cmd_parser.generate_help_text
     end
 
+    def command_help_lines(path)
+      path.read
+          .lines
+          .grep(/^#:/)
+          .map { |line| line.slice(2..-1).delete_prefix("  ") }
+    end
+    private_class_method :command_help_lines
+
     def comment_help(path)
       # Otherwise read #: lines from the file.
       help_lines = command_help_lines(path)

Library/Homebrew/utils.rb

@@ -511,13 +511,6 @@ module Kernel
     end
   end
 
-  def command_help_lines(path)
-    path.read
-        .lines
-        .grep(/^#:/)
-        .map { |line| line.slice(2..-1).delete_prefix("  ") }
-  end
-
   def redact_secrets(input, secrets)
     secrets.compact
            .reduce(input) { |str, secret| str.gsub secret, "******" }