chore(errors): fix grammar typo and wording in errors exercises

exercises/error_handling/errors2.rs

@@ -3,7 +3,7 @@
 // Say we're writing a game where you can buy items with tokens. All items cost
 // 5 tokens, and whenever you purchase items there is a processing fee of 1
 // token. A player of the game will type in how many items they want to buy, and
-// the `total_cost` function will calculate the total cost of the tokens. Since
+// the `total_cost` function will calculate the total cost of the items. Since
 // the player typed in the quantity, though, we get it as a string-- and they
 // might have typed anything, not just numbers!
 //

info.toml

@@ -658,7 +658,7 @@ name = "errors1"
 path = "exercises/error_handling/errors1.rs"
 mode = "test"
 hint = """
-`Ok` and `Err` are one of the variants of `Result`, so what the tests are saying
+`Ok` and `Err` are the two variants of `Result`, so what the tests are saying
 is that `generate_nametag_text` should return a `Result` instead of an `Option`.
 
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