Correct <send>, <receive>, and <block> tags

REMOVE Form from the Parent list for the <send> tag: Standard VoiceXML > VoiceXML Tags <send> . . . Parent Block, Catch, Error, Filled, Foreach, Form, Help, If, Noinput, and Nomatch

Child None.

REMOVE Form from the Parent list for the <receive> tag: Standard VoiceXML > VoiceXML Tags <receive> . . . Parent Block, Catch, Error, Filled, Foreach, Form, Help, If, Noinput, and Nomatch

Child None.

ADD send and receive to the Child list for the <block> tag:

Standard VoiceXML > VoiceXML Tags <block> . . . Parent Form

Child Assign, Clear, Data, Disconnect, Exit, Foreach, Goto, If, Log, Prompt, Receive, Reprompt, Return, Script, Send, Submit, Text (#PCDATA), Throw, Value, and Var