Fix issues in content (#10943)

* Fix issues in content

Signed-off-by: mooncake <xcoder@tenxcloud.com>

* rollback file

content/en/docs/concepts/policy/pod-security-policy.md

@@ -457,7 +457,7 @@ root filesystem (i.e. no writable layer).
 
 ### Flexvolume drivers
 
-This specifies a whiltelist of Flexvolume drivers that are allowed to be used
+This specifies a whitelist of Flexvolume drivers that are allowed to be used
 by flexvolume. An empty list or nil means there is no restriction on the drivers.
 Please make sure [`volumes`](#volumes-and-file-systems) field contains the
 `flexVolume` volume type; no Flexvolume driver is allowed otherwise.

content/en/docs/tasks/extend-kubectl/kubectl-plugins.md

@@ -191,7 +191,7 @@ The command from the above example, can be invoked using either a dash (`-`) or
 $ kubectl foo-bar
 I am a plugin with a dash in my name
 
-# it can also be inovked using an underscore
+# it can also be invoked using an underscore
 $ kubectl foo_bar
 I am a plugin with a dash in my name
 ```

content/en/docs/tasks/run-application/horizontal-pod-autoscale.md

@@ -159,7 +159,7 @@ replica counts is chosen.  If any of those metrics cannot be converted
 into a desired replica count (e.g. due to an error fetching the metrics
 from the metrics APIs), scaling is skipped.
 
-Finally, just before HPA scales the target, the scale reccomendation is recorded.  The
+Finally, just before HPA scales the target, the scale recommendation is recorded.  The
 controller considers all recommendations within a configurable window choosing the
 highest recommendation from within that window. This value can be configured using the `--horizontal-pod-autoscaler-downscale-stabilization-window` flag, which defaults to 5 minutes.
 This means that scaledowns will occur gradually, smoothing out the impact of rapidly