man: fix Ruby syntax warning
Library/Homebrew/cmd/man.rb:44: warning: assigned but unused variable - commands
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@ -41,7 +41,7 @@ module Homebrew
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def build_man_page
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template = (SOURCE_PATH/"brew.1.md.erb").read
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commands = Pathname.glob("#{HOMEBREW_LIBRARY_PATH}/cmd/*.{rb,sh}").
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Pathname.glob("#{HOMEBREW_LIBRARY_PATH}/cmd/*.{rb,sh}").
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sort_by { |source_file| source_file.basename.sub(/\.(rb|sh)$/, "") }.
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map { |source_file|
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source_file.read.lines.
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