@rem() and @mod() take denominator != 0, not just denominator > 0

#23635

I also added tests for `@rem()` with `denominator < 0` cause there were none before
I hope I added them in the correct place, if not I can change it ofc

Author: IOKG04

doc/langref.html.in

@@ -5179,7 +5179,7 @@ fn cmpxchgWeakButNotAtomic(comptime T: type, ptr: *T, expected_value: T, new_val
       <pre>{#syntax#}@mod(numerator: T, denominator: T) T{#endsyntax#}</pre>
       <p>
       Modulus division. For unsigned integers this is the same as
-      {#syntax#}numerator % denominator{#endsyntax#}. Caller guarantees {#syntax#}denominator > 0{#endsyntax#}, otherwise the
+      {#syntax#}numerator % denominator{#endsyntax#}. Caller guarantees {#syntax#}denominator != 0{#endsyntax#}, otherwise the
       operation will result in a {#link|Remainder Division by Zero#} when runtime safety checks are enabled.
       </p>
       <ul>
@@ -5284,7 +5284,7 @@ fn cmpxchgWeakButNotAtomic(comptime T: type, ptr: *T, expected_value: T, new_val
       <pre>{#syntax#}@rem(numerator: T, denominator: T) T{#endsyntax#}</pre>
       <p>
       Remainder division. For unsigned integers this is the same as
-      {#syntax#}numerator % denominator{#endsyntax#}. Caller guarantees {#syntax#}denominator > 0{#endsyntax#}, otherwise the
+      {#syntax#}numerator % denominator{#endsyntax#}. Caller guarantees {#syntax#}denominator != 0{#endsyntax#}, otherwise the
       operation will result in a {#link|Remainder Division by Zero#} when runtime safety checks are enabled.
       </p>
       <ul>

test/behavior/math.zig

@@ -531,6 +531,8 @@ fn testIntDivision() !void {
     try expect(rem(i32, 10, 12) == 10);
     try expect(rem(i32, -14, 12) == -2);
     try expect(rem(i32, -2, 12) == -2);
+    try expect(rem(i32, 118, -12) == 10);
+    try expect(rem(i32, -14, -12) == -2);
     try expect(rem(i16, -118, 12) == -10);
 
     try expect(divTrunc(i20, 20, -5) == -4);