5.5.1.2 Message: description

Typo: In Return Value, replace:

<readable>

with:

<readableString>

5.5.3.1 Message: messageText: signalerText

Typo: In Definition, replace:

Subseqent

with:

Subsequent

and replace (2 occurances):

1. messgeText

with:

1. messageText

5.5.18 Protocol: <MessageNotUnderstood>

In Messages, remove the duplicate #message and the associated section 5.5.18.1