docs: add changesets for changes since v5.5.0 (#674)

Author: alexander-akait

.changeset/array-of-minimizers.md

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+---
+"terser-webpack-plugin": minor
+---
+
+support array of minimizers for `minify` and `terserOptions`

.changeset/builtin-css-minimizers.md

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+---
+"terser-webpack-plugin": minor
+---
+
+add built-in CSS minimizers from `css-minimizer-webpack-plugin`

.changeset/builtin-html-minimizers.md

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+---
+"terser-webpack-plugin": minor
+---
+
+add built-in HTML minimizers from `html-minimizer-webpack-plugin`

.changeset/minimizer-filter.md

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+---
+"terser-webpack-plugin": minor
+---
+
+add `filter` method to minimizers, allowing a single plugin instance to handle multiple asset types

.changeset/rename-terser-options.md

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+---
+"terser-webpack-plugin": minor
+---
+
+rename `terserOptions` to `minimizerOptions`; `terserOptions` is kept as a deprecated alias