Formatter README links rules.ts and names createRulesMap, which the Go port does not have #64939

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Hey folks,

First issue so hopefully I get this right!

tsc/internal/format/README.md still describes the formatter as it was in the TypeScript 6 code base:

• Line 22 links ./rules.ts, which does not exist, so the link is broken on GitHub. The rules are in tsc/internal/format/rules.go.
• It says processPair requests its rules "via createRulesMap". The Go port has no such function. processPair calls getRules (span.go), which reads the map that buildRulesMap builds once (rulesmap.go).

The other functions the README names (FormatSpan, processNode, processPair) still exist in api.go and span.go.

Suggested fix: point the link at rules.go, and name getRules and buildRulesMap in place of createRulesMap. PR #1 makes this change.

Found with a little tool I'm building called CSH, a static analysis tool that compares a repository's prose with its code, and checked by hand. AI assistance (Claude Code) was used to find and draft it.