[fix] correct small errors in array, bitmap, and bitwise function docs

[boluor]

Summary

Fixes 9 small documentation issues across array, bitmap, and bitwise function references. Each item below is independent.

• array-sortby.md — example ARRAY_SORTBY(x -> x*2 <= 2, [1,2,3]) with keys [true,false,false] showed result [1,2,3]. Sorting with these keys (false sorts before true; stable order) yields [2,3,1].
• array-filter.md — the closing border of the first result table was 42 dashes while the cells above were 50. Widened to match.
• array-shuffle.md — removed an orphan empty - bullet sitting between the notes list and the ## Examples heading.
• array-first.md — two error-example captions were swapped (each described the other's error). Restored the correct mapping.
• arrays-overlap.md — replaced a stray ◊ placeholder in the description and ## Function paragraph with determine (the intended verb).
• array.md — frontmatter "language": "en-US" → "en"; the parameter line used a full-width Chinese ： instead of an ASCII : .
• bitmap-hash.md — the example select bitmap_to_string(bitmap_hash(NULL)); had no column alias, but the result-table header showed res. Added AS res to the query.
• bitshiftright.md — frontmatter "language": "zh-CN" in an English doc → "en".
• xor.md (bitwise-functions) — same "zh-CN" → "en" frontmatter fix.

Test plan

• CI doc build passes
• Spot-check the affected pages render correctly (array-sortby result, array-filter table border, array-shuffle notes list, array-first error sections, arrays-overlap description, array.md parameter line, bitmap-hash query/result, language metadata for bitshiftright and xor)