Merge pull request #1819 from gerases/grammar-fix

Correct for more standard English

exercises/11_hashmaps/hashmaps3.rs

@@ -36,7 +36,7 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
         let team_2_score: u8 = v[3].parse().unwrap();
         // TODO: Populate the scores table with details extracted from the
         // current line. Keep in mind that goals scored by team_1
-        // will be the number of goals conceded from team_2, and similarly
+        // will be the number of goals conceded by team_2, and similarly
         // goals scored by team_2 will be the number of goals conceded by
         // team_1.
     }