Messages - 1, 3.2.1, 3.2.2 use of the word Assertion

[gffletch]

Remove the definition of Assertion in section 1 and the use of the word assertion from the doc until section 8. Replace with appropriate language.

[Michael Jones]

Fix #218 Messages - 1, 3.2.1, 3.2.2 use of the word Assertion Replaced the terms "Positive Assertion" and "Negative Assertion" with "successful response" and "error response". As part of this fix, also removed uses of the term "claim object". Finally, replaced numerous erroneous uses of "it's" with "its".

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