* lib/cmath.rb: shouldn't use non-ASCII characters in documentation. as a

custom, single quote is seen as the same as apostrophe in computer typography.
  [skip ci]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51120 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/cmath.rb

@@ -7,7 +7,7 @@
 #
 # Note that the selection of functions is similar, but not identical,
 # to that in module math. The reason for having two modules is that
-# some users aren’t interested in complex numbers, and perhaps don’t
+# some users aren't interested in complex numbers, and perhaps don't
 # even know what they are. They would rather have Math.sqrt(-1) raise
 # an exception than return a complex number.
 #