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Fix format string grammar in docs and improve alignment error message for #144023 This PR improves error messages and documentation for format strings involving alignment and formatting traits. Highlights: - Clearer error messages for invalid alignment specifiers (e.g., `{0:#X>18}`), showing the expected `<`, `^`, or `>` and a working example: println!("{0:>#18X}", value); - Updated UI test `format-alignment-hash.rs` to reflect the improved error output. - Documentation clarification: ensures examples correctly show how width, alignment, and traits like `x`, `X`, `#` combine. Motivation: Previously, using `#` with alignment and width produced confusing errors. This PR guides users on the correct syntax and provides actionable examples. Testing: - Built the compiler (`./x build`) - Blessed and ran UI tests (`./x. test src/test/ui/fmt/format-alignment-hash.rs --bless`) - Verified full test suite passes (`./x test`) Issue: rust-lang/rust#144023