Fix broken examples and typos in the README

[tylerturdenpants]

Several of the README's examples don't run. Each fix here was verified by executing the example against src/ and comparing to the documented output.

Broken syntax

• The Transformer example had a stray paren before the params in both the asyncMap and asyncEach callbacks ((contents, coordinates => {), so neither block was valid JS.
• The package.json snippet was fenced as ```js, which made it invalid JS.

Wrong API

• The Transformer example called await t.transform(...), which is not a method on Transformer. Changed to t.asyncMap().
• The reverseInnerCoordinates example imported reverseInnerCoordinates from the package root and called extractTemplates(file). Neither is exported from src/index.js, extractTemplates was never imported in the example, and templateInfos[0]! is a TS non-null assertion inside a ```js block. Rewritten against the public API (t.reverseInnerCoordinatesOf(t.parseResults[0], innerCoordinates)) and the heading renamed to match the method that actually exists.

Wrong documented output

• The unprocess example claimed a result of just export default <template>hi there</template>;. The function preserves the type import and the satisfies clause, so the result block now shows what it really returns.

Docs gaps

• Adds t.parseResultAt(coordinates) and t.toStringWithTemplatePlaceholders() to the Properties / Methods list. For parseResultAt the non-obvious part is documented: a partial coordinates object works, and { start }, { end }, or { line, column } are each enough to match.
• Fixes prose typos: "keeping tracked of", "clasing", "any attributes are key-value pairs", "functions that wraps", "if anyone were done", and a closingTag value written as '</template' with no closing >.

All 7 JS blocks in the README now pass node --check; 3 of them failed before. Prettier, tsc --noEmit, and all 90 tests pass.

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