Merge pull request #22694 from allencloud/fix-typos-in-docs

docs: correct some typos

docs/migration.md

@@ -29,7 +29,7 @@ instructions that didn’t modify the filesystem.
 
 Content addressability is the foundation for the new distribution features. The
 image pull and push code has been reworked to use a download/upload manager
-concept that makes pushing and pulling images much more stable and mitigate any
+concept that makes pushing and pulling images much more stable and mitigates any
 parallel request issues. The download manager also brings retries on failed
 downloads and better prioritization for concurrent downloads.
 

docs/security/apparmor.md

@@ -232,7 +232,7 @@ Congrats! You just deployed a container secured with a custom apparmor profile!
 
 ## Debug AppArmor
 
-You can use `demsg` to debug problems and `aa-status` check the loaded profiles.
+You can use `dmesg` to debug problems and `aa-status` check the loaded profiles.
 
 ### Use dmesg
 

docs/security/seccomp.md

@@ -27,7 +27,7 @@ CONFIG_SECCOMP=y
 
 > **Note**: seccomp profiles require seccomp 2.2.1 and are only
 > available starting with Debian 9 "Stretch", Ubuntu 15.10 "Wily",
-> Fedora 22, centos 7 and Oracle Linux 7. To use this feature on Ubuntu 14.04, Debian Wheezy, or
+> Fedora 22, CentOS 7 and Oracle Linux 7. To use this feature on Ubuntu 14.04, Debian Wheezy, or
 > Debian Jessie, you must download the [latest static Docker Linux binary](../installation/binaries.md).
 > This feature is currently *not* available on other distributions.