Escape interpolation examples

Library/Homebrew/formula_cellar_checks.rb

@@ -18,7 +18,7 @@ module FormulaCellarChecks
     ['A top-level "man" directory was found.',
       <<-EOS.undent
         Homebrew requires that man pages live under share.
-        This can often be fixed by passing "--mandir=#{man}" to configure.
+        This can often be fixed by passing "--mandir=\#{man}" to configure.
       EOS
     ]
   end
@@ -30,7 +30,7 @@ module FormulaCellarChecks
     ['A top-level "info" directory was found.',
       <<-EOS.undent
         Homebrew suggests that info pages live under share.
-        This can often be fixed by passing "--infodir=#{info}" to configure.
+        This can often be fixed by passing "--infodir=\#{info}" to configure.
       EOS
     ]
   end