* doc/contributing.rdoc: fixed wrong instructions with OS X

[fix GH-989][ci skip] Patch by @schneems

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51476 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Aug  4 09:21:58 2015  Richard Schneeman  <richard.schneeman+foo@gmail.com>
+
+	* doc/contributing.rdoc: fixed wrong instructions with OS X
+	[fix GH-989][ci skip] Patch by @schneems
+
 Mon Aug  3 10:08:33 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* re.c (rb_memsearch): should match only char boundaries in wide

doc/contributing.rdoc

@@ -312,7 +312,7 @@ Now let's build CRuby:
     autoconf
     mkdir build && cd build # its good practice to build outside of source dir
     mkdir ~/.rubies # we will install to .rubies/ruby-trunk in our home dir
-    ../configure --prefix=~/.rubies/ruby-trunk
+    ../configure --prefix='$(~/).rubies/ruby-trunk'
     make && make install
 
 After adding Ruby to your PATH, you should be ready to run the test suite: