* ext/zlib/zlib.c: fix a typo.

[ci skip][fix GH-1149] Patch by @crismali

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53118 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Dec 15 11:55:08 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* ext/zlib/zlib.c: fix a typo.
+	  [ci skip][fix GH-1149] Patch by @crismali
+
 Tue Dec 15 09:14:14 2015  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* tool/transcode_tablegen.rb: detailled documentation

ext/zlib/zlib.c

@@ -3630,7 +3630,7 @@ rb_gzwriter_putc(VALUE obj, VALUE ch)
  * Document-class: Zlib::GzipReader
  *
  * Zlib::GzipReader is the class for reading a gzipped file.  GzipReader should
- * be used an IO, or -IO-like, object.
+ * be used as an IO, or -IO-like, object.
  *
  *   Zlib::GzipReader.open('hoge.gz') {|gz|
  *     print gz.read