[ruby/optparse] Fix typo in documentation

- "hypnen" -> "hyphen"
- "hadler" -> "handler"

ruby/optparse@e70e689ded

doc/optparse/option_params.rdoc

@@ -418,7 +418,7 @@ A description parameter is any string parameter
 that is not recognized as an
 {option name}[#label-Option+Names] or a
 {terminator}[#label-Terminators];
-in other words, it does not begin with a hypnen.
+in other words, it does not begin with a hyphen.
 
 You may give any number of description parameters;
 each becomes a line in the text generated by option <tt>--help</tt>.
@@ -453,7 +453,7 @@ when the option is encountered.  The handler may be:
 
 ==== Handler Blocks
 
-An option hadler may be a block.
+An option handler may be a block.
 
 File +block.rb+ defines an option that has a handler block.