eliminate some shifts in table parser and clarify.

[kivikakk]

No description provided.

[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
./bench.sh ./comrak-558bc20	108.1 ± 1.1	106.6	112.0	1.88 ± 0.04
./bench.sh ./comrak-main	110.2 ± 3.9	107.5	126.4	1.92 ± 0.08
./bench.sh ./pulldown-cmark	57.4 ± 1.1	56.2	62.9	1.00
./bench.sh ./cmark-gfm	84.3 ± 7.0	79.7	102.9	1.47 ± 0.13
./bench.sh ./markdown-it	254.1 ± 3.2	249.0	260.4	4.43 ± 0.10

Run on Sun Oct 19 09:37:54 UTC 2025

[kivikakk]

/run-bench