Update dataset card for v2: Scylla v2 + SP4096/8192/12288/16384 (#4)

Add fineweb_sp16384/ (SentencePiece BPE 16384) (fineweb_train_000000.bin) (#9)

Add fineweb_sp12288/ (SentencePiece BPE 12288) (fineweb_train_000000.bin) (#8)

Add fineweb_byte260/ (pure-byte PureByteTokenizer pad=256 bos=257) (fineweb_train_000000.bin) (#7)

Add fineweb_sp4096/ (SentencePiece BPE 4096) (fineweb_train_000000.bin) (#6)

Add fineweb_sp8192/ (SentencePiece BPE 8192) (fineweb_train_000000.bin) (#5)

Add fineweb_scylla_v2/ (corrected byte-exact 1254-token vocab, PR #1314) (#3)

Add tokenizers/scylla_v2/scylla.meta.npz (PR #1314 byte-exact Scylla) (#2)

Add tokenizers/scylla_v2/scylla.yaml (PR #1314 byte-exact Scylla) (#1)

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