fix typos

Signed-off-by: allencloud <allen.sun@daocloud.io>

man/docker-attach.1.md

@@ -43,7 +43,7 @@ attaching to a tty-enabled container (i.e.: launched with `-t`).
 
 # Override the detach sequence
 
-If you want, you can configure a override the Docker key sequence for detach.
+If you want, you can configure an override the Docker key sequence for detach.
 This is is useful if the Docker default sequence conflicts with key squence you
 use for other applications. There are two ways to defines a your own detach key
 sequence, as a per-container override or as a configuration property on  your

man/docker-inspect.1.md

@@ -223,7 +223,7 @@ output:
 You can get more information about how to write a Go template from:
 https://golang.org/pkg/text/template/.
 
-## Getting size information on an container
+## Getting size information on a container
 
     $ docker inspect -s d2cc496561d6
     [

man/docker-run.1.md

@@ -219,7 +219,7 @@ See **config-json(5)** for documentation on using a configuration file.
    Limit write rate to a device (e.g. --device-write-bps=/dev/sda:1mb)
 
 **--device-write-iops**=[]
-   Limit write rate a a device (e.g. --device-write-iops=/dev/sda:1000)
+   Limit write rate to a device (e.g. --device-write-iops=/dev/sda:1000)
 
 **--dns-search**=[]
    Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search domain)