remove rdf:PlainLiteral and add a change note; also add change note for triple terms

[pfps]

Fixes #84
Implements w3c/rdf-star-wg#147

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[TallTed]

I believe this appendix is INFORMATIVE, so MUST (line 2297) should be made lowercase and recommended (line 2300) should be kept so. If this appendix is NORMATIVE, then MUST (line 2297) should be kept uppercase, and recommended (line 2300) should also be made so. In either case, the introductory In RDF 1.1 should be followed by a comma.

Suggested change

	In RDF 1.1 <code>rdf:PlainLiteral</code> was described as an optional datatype that, if recognized,
	MUST be interpreted to denote the datatype defined in [[RDF-PLAIN-LITERAL]].
	<code>rdf:PlainLiteral</code> is not used elsewhere in the RDF documents,
	so the requirement to give it this particular semantics has been removed.
	It is recommended that <code>rdf:PlainLiteral</code> not be used in RDF.
	In RDF 1.1, <code>rdf:PlainLiteral</code> was described as an optional datatype that, if recognized,
	must be interpreted to denote the datatype defined in [[RDF-PLAIN-LITERAL]].
	<code>rdf:PlainLiteral</code> is not used elsewhere in the RDF documents,
	so the requirement to give it this particular semantics has been removed.
	It is recommended that <code>rdf:PlainLiteral</code> not be used in RDF.

[pfps]

My understanding is that commas are optional after short introductory phrases.

[pfps]

The MUST wording is from RDF 1.1, where it was in a normative section, so it should be MUST here because it was MUST there. This section is non-normative so recommended is lower case. (This sentence may be removed, however.)

[TallTed]

My understanding is that commas are optional after short introductory phrases.

Yes, "commas are optional after short introductory phrases", and, when omitted, they are inferred by strong/native readers of English. However, we are not writing for strong/native readers of English; we are writing for anyone on Earth. It is therefore better to include such optional commas.

The MUST wording is from RDF 1.1, where it was in a normative section, so it should be MUST here because it was MUST there. This section is non-normative so recommended is lower case. (This sentence may be removed, however.)

As a quotation from RDF 1.1, the phrase should be wrapped in quotation marks. Optimally, there would be a citation with a direct link to where this statement occurs. I generated that link with Chrome which may still be the only browser that creates them properly, but if my Google searching has been sufficient, most (Chrome, Safari, Edge, Firefox) if not all current browsers can dereference them properly. I don't know what ReSpec markup to use for such a citation, especially not if retaining the <a ... /a> within the quotation.... Also note the [denote] which replaced the original refer to.

Suggested change

	In RDF 1.1 <code>rdf:PlainLiteral</code> was described as an optional datatype that, if recognized,
	MUST be interpreted to denote the datatype defined in [[RDF-PLAIN-LITERAL]].
	<code>rdf:PlainLiteral</code> is not used elsewhere in the RDF documents,
	so the requirement to give it this particular semantics has been removed.
	It is recommended that <code>rdf:PlainLiteral</code> not be used in RDF.
	In RDF 1.1, <code>rdf:PlainLiteral</code> was described as an optional datatype
	that, "[if] [recognized](https://www.w3.org/TR/rdf11-mt/#dfn-recognize), ...
	must be interpreted to [denote] the datatype defined in [[RDF-PLAIN-LITERAL]]."
	<code>rdf:PlainLiteral</code> is not used elsewhere in the RDF documents,
	so the requirement to give it this particular semantics has been removed.
	It is recommended that <code>rdf:PlainLiteral</code> not be used in RDF.