Fix formatting of comment

exercises/076_sentinels.zig

@@ -74,7 +74,7 @@ pub fn main() void {
 fn printSequence(my_seq: anytype) void {
     const my_typeinfo = @typeInfo(@TypeOf(my_seq));
 
-    // The TypeInfo contained in my_typeinfo is a union. We use 
+    // The TypeInfo contained in my_typeinfo is a union. We use
     // a switch to handle printing the Array or Pointer fields,
     // depending on which type of my_seq was passed in:
     switch (my_typeinfo) {