Minor editorial issues on the cumulative charter text

[iherman]

• removed Turtle and kept only TriG for the mission (to make it shorter)
• proper capitalization of n-quads
• link systematically to the explainer in the scope's second paragraph (needed some minor re-structuring of the explainer, too)
• updated the link to the rdf dataset canonicalization draft
• the link https://w3c-ccg.github.io/ld-security/ (Linked Data Security 1.0) was 404. I think the replacement is https://w3c-ccg.github.io/ld-proofs/ Linked Data Proofs 1.0. (@msporny, is that correct?)

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