Fix some formating issues

react.md

@@ -154,7 +154,6 @@ class Info extends Component {
   }
 }
 ```
-
 {: data-line="5,6,7,8,9,10"}
 
 Nest components to separate concerns.

ruby.md

@@ -8,7 +8,6 @@ intro: |
 ---
 
 ### Reference
-
 {:.-one-column}
 
 | Code                    | Description                                               |

sed.md

@@ -31,17 +31,16 @@ sed -i 's/match1/replace1/g; s/match2/replace2/g' \
 
 ```
 
-replace different matchs with different values
+replace different matches with different values
 
 ```bash
 sed -i 's/\(MATCH1\|MATCH2\)/VALUE/g' \
 
 ```
 
-replace multiple matchs with the same value
+replace multiple matches with the same value
 
 ## File regions
-
 {:.-three-column}
 
 ### Print until a certain line is met

sequel.md

@@ -5,7 +5,6 @@ layout: 2017/sheet
 ---
 
 ### About
-
 {: .-intro}
 
 Sequel is a database toolkit for Ruby.