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improve @enumFromInt doc (#20354)

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closes #19123
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doc/langref.html.in
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@ -4710,8 +4710,11 @@ fn cmpxchgWeakButNotAtomic(comptime T: type, ptr: *T, expected_value: T, new_val
Converts an integer into an {#link|enum#} value. The return type is the inferred result type.
</p>
<p>
Attempting to convert an integer which represents no value in the chosen enum type invokes
Attempting to convert an integer with no corresponding value in the enum invokes
safety-checked {#link|Undefined Behavior#}.
Note that a {#link|non-exhaustive enum|Non-exhaustive enum#} has corresponding values for all
integers in the enum's integer tag type: the {#syntax#}_{#endsyntax#} value represents all
the remaining unnamed integers in the enum's tag type.
</p>
{#see_also|@intFromEnum#}
{#header_close#}