Updated documentation

docs/readme.md

@@ -10,32 +10,42 @@ cargo install fnl
 
 ## Usage
 
+### Single file
+
 Show status:
 
 ```shell
 fnl file.txt
 ```
 
+Add final newline:
+
+```shell
+fnl --add file.txt
+```
+
+Remove final newline:
+
+```shell
+fnl --remove file.txt
+```
+
+### Multiple files
+
+Show status:
+
 ```shell
 find . -type f -name "*.txt" | xargs fnl
 ```
 
 Add final newlines:
 
-```shell
-fnl --add file.txt
-```
-
 ```shell
 find . -type f -name "*.txt" | xargs fnl --add
 ```
 
 Remove final newlines:
 
-```shell
-fnl --remove file.txt
-```
-
 ```shell
 find . -type f -name "*.txt" | xargs fnl --remove
 ```