fix(typos): correct spelling mistakes

src/event.zig

@@ -69,7 +69,7 @@ pub fn mergeTaggedUnions(comptime A: type, comptime B: type) type {
     } });
 }
 
-// Determine at `comptime` wether the provided type `E` is an `union(enum)`.
+// Determine at `comptime` whether the provided type `E` is an `union(enum)`.
 pub fn isTaggedUnion(comptime E: type) bool {
     switch (@typeInfo(E)) {
         .Union => |u| {