[DOC] Tweaks for StringIO.getbyte (#188)

Author: BurdetteLamar

doc/stringio/getbyte.rdoc

@@ -14,16 +14,18 @@ Returns +nil+ if at end-of-stream:
 
 Returns a byte, not a character:
 
-  s = 'тест'
-  s.bytes       # => [209, 130, 208, 181, 209, 129, 209, 130]
+  s = 'Привет'
+  s.bytes
+  # => [208, 159, 209, 128, 208, 184, 208, 178, 208, 181, 209, 130]
   strio = StringIO.new(s)
-  strio.getbyte # => 209
-  strio.getbyte # => 130
+  strio.getbyte # => 208
+  strio.getbyte # => 159
 
   s = 'こんにちは'
-  s.bytes       # => [227, 129, 147, 227, 130, 147, 227, 129, 171, 227, 129, 161, 227, 129, 175]
+  s.bytes
+  # => [227, 129, 147, 227, 130, 147, 227, 129, 171, 227, 129, 161, 227, 129, 175]
   strio = StringIO.new(s)
   strio.getbyte # => 227
   strio.getbyte # => 129
 
-Related: StringIO.getc.
+Related: #each_byte, #ungetbyte, #getc.