Remove redundant parameter and fix typos

Signed-off-by: yuexiao-wang <wang.yuexiao@zte.com.cn>
Upstream-commit: 0b24403d99
Component: cli

components/cli/docs/reference/commandline/diff.md

@@ -24,7 +24,7 @@ Options:
       --help   Print usage
 ```
 
-List the changed files and directories in a container᾿s filesystem
+List the changed files and directories in a container᾿s filesystem.
  There are 3 events that are listed in the `diff`:
 
 1. `A` - Add