[LangRef/DataLayout] Spell out requirements for alignment values (#104705) For 'p' the added wording matches the implementation. For 'i', 'f', 'v' the implementation also allows 0 for `<pref>` component, making 'i16:16:0' valid, for example. 'Fi0', 'Fn0' and 'S0' are also currently accepted. This is likely unintentional. There are no tests in the codebase that rely on this behavior, so the added wording prohibits zero alignments for these specifications. For 'a', the implementation currently allows 0 for both `<abi>` and `<pref>` components. The added wording prohibits specifying zero for `<pref>` with the same justification as above. Zero `<abi>` is used in tests, and the example at the end of the section suggests that this is valid, so that's left unchanged. This effectively prohibits zero alignments everywhere except for the `<abi>` component of aggregate specification.
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