Fix some spelling errors

Signed-off-by: JoeWrightss <zhoulin.xie@daocloud.io>

pkg/ns/README.md

@@ -24,13 +24,13 @@ err = targetNs.Do(func(hostNs ns.NetNS) error {
 
 Note this requirement to wrap every network call is very onerous - any libraries you call might call out to network services such as DNS, and all such calls need to be protected after you call `ns.Do()`. All goroutines spawned from within the `ns.Do` will not inherit the new namespace. The CNI plugins all exit very soon after calling `ns.Do()` which helps to minimize the problem.
 
-When a new thread is spawned in Linux, it inherits the namepaces of its parent. In versions of go **prior to 1.10**, if the runtime spawns a new OS thread, it picks the parent randomly. If the chosen parent thread has been moved to a new namespace (even temporarily), the new OS thread will be permanently "stuck in the wrong namespace", and goroutines will non-deterministically switch namespaces as they are rescheduled.
+When a new thread is spawned in Linux, it inherits the namespace of its parent. In versions of go **prior to 1.10**, if the runtime spawns a new OS thread, it picks the parent randomly. If the chosen parent thread has been moved to a new namespace (even temporarily), the new OS thread will be permanently "stuck in the wrong namespace", and goroutines will non-deterministically switch namespaces as they are rescheduled.
 
 In short, **there was no safe way to change network namespaces, even temporarily, from within a long-lived, multithreaded Go process**. If you wish to do this, you must use go 1.10 or greater. 
 
 
 ### Creating network namespaces
-Earlier versions of this library managed namespace creation, but as CNI does not actually utilize this feature (and it was essentialy unmaintained), it was removed. If you're writing a container runtime, you should implement namespace management yourself. However, there are some gotchas when doing so, especially around handling `/var/run/netns`. A reasonably correct reference implementation, borrowed from `rkt`, can be found in `pkg/testutils/netns_linux.go` if you're in need of a source of inspiration.
+Earlier versions of this library managed namespace creation, but as CNI does not actually utilize this feature (and it was essentially unmaintained), it was removed. If you're writing a container runtime, you should implement namespace management yourself. However, there are some gotchas when doing so, especially around handling `/var/run/netns`. A reasonably correct reference implementation, borrowed from `rkt`, can be found in `pkg/testutils/netns_linux.go` if you're in need of a source of inspiration.
 
 
 ### Further Reading

plugins/ipam/dhcp/client.go

@@ -78,7 +78,7 @@ func DhcpRequest(c *dhcp4client.Client, options dhcp4.Options) (bool, dhcp4.Pack
 }
 
 //Renew a lease backed on the Acknowledgement Packet.
-//Returns Sucessfull, The AcknoledgementPacket, Any Errors
+//Returns Successful, The AcknoledgementPacket, Any Errors
 func DhcpRenew(c *dhcp4client.Client, acknowledgement dhcp4.Packet, options dhcp4.Options) (bool, dhcp4.Packet, error) {
 	renewRequest := c.RenewalRequestPacket(&acknowledgement)
 

vendor/github.com/d2g/dhcp4client/client.go

@@ -383,7 +383,7 @@ func (c *Client) Request() (bool, dhcp4.Packet, error) {
 }
 
 //Renew a lease backed on the Acknowledgement Packet.
-//Returns Sucessfull, The AcknoledgementPacket, Any Errors
+//Returns Successful, The AcknoledgementPacket, Any Errors
 func (c *Client) Renew(acknowledgement dhcp4.Packet) (bool, dhcp4.Packet, error) {
 	renewRequest := c.RenewalRequestPacket(&acknowledgement)
 	renewRequest.PadToMinSize()