[DOC] Respond to review

Author: BurdetteLamar

doc/stringio/getc.rdoc

@@ -31,4 +31,4 @@ in other cases that need not be true:
    strio.pos = 5 # => 5     # At third byte of second character; returns byte.
    strio.getc    # => "\x93"
 
-Related: #each_char, #putc, #ungetc.
+Related: #getbyte, #putc, #ungetc.