Update solution.md

Grammar suggestions

Author: hrodward

1-js/11-async/03-promise-chaining/01-then-vs-catch/solution.md

@@ -1,4 +1,4 @@
-The short answer is: **no, they are not the equal**:
+The short answer is: **no, they are not equal**:
 
 The difference is that if an error happens in `f1`, then it is handled by `.catch` here:
 
@@ -17,4 +17,4 @@ promise
 
 That's because an error is passed down the chain, and in the second code piece there's no chain below `f1`.
 
-In other words, `.then` passes results/errors to the next `.then/catch`. So in the first example, there's a `catch` below, and in the second one -- there isn't, so the error is unhandled.
+In other words, `.then` passes results/errors to the next `.then/catch`. So in the first example, there's a `catch` below, and in the second one there isn't, so the error is unhandled.