sprintf.c: fix typo

* sprintf.c: [DOC] fix typo.
  Patch by Lazarus Lazaridis (iridakos).  [Fix GH-1789]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63242 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sprintf.c

@@ -203,7 +203,7 @@ get_hash(volatile VALUE *hash, int argc, const VALUE *argv)
  *  any additional arguments.  Within the format string, any characters
  *  other than format sequences are copied to the result.
  *
- *  The syntax of a format sequence is follows.
+ *  The syntax of a format sequence is as follows.
  *
  *    %[flags][width][.precision]type
  *