fix(docs): broken link in strings section (#4028)

Closes winglang/docsite#586

## Checklist

- [ ] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [ ] Description explains motivation and solution
- [ ] Tests added (always)
- [ ] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end testing

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docs/docs/03-language-reference.md

@@ -1964,7 +1964,7 @@ assert(cat1 != dog); // compile time error (can't compare different types)
 
 ### 6.2 Strings
 
-String reference doc is available [here](https://www.winglang.io/docs/language-guide/language-reference#61-strings).
+String reference doc is available [here](https://www.winglang.io/docs/standard-library/std/api-reference#string-).
 Type of string is UTF-16 internally.  
 All string declaration variants are multi-line.