Merge pull request #2839 from xichengliudui/fix181023

Fixing grammatical errors

contributors/design-proposals/api-machinery/auditing.md

@@ -243,7 +243,7 @@ type PolicyRule struct {
     // An empty list implies every user.
     Users []string
     // The user groups this rule applies to. If a user is considered matching
-    // if the are a member of any of these groups
+    // if they are a member of any of these groups
     // An empty list implies every user group.
     UserGroups []string
 

contributors/design-proposals/node/secret-configmap-downwardapi-file-mode.md

@@ -169,7 +169,7 @@ Adding it there allows the user to change the mode bits of every file in the
 object, so it achieves the goal, while having the option to have a default and
 not specify all files in the object.
 
-The are two downside:
+There are two downsides:
 
  * The files are symlinks pointint to the real file, and the realfile
    permissions are only set. The symlink has the classic symlink permissions.

sig-scalability/slos/slos.md

@@ -89,7 +89,7 @@ MUST satisfy thresholds defined in [thresholds file][].
 ## Kubernetes SLIs/SLOs
 
 The currently existing SLIs/SLOs are enough to guarantee that cluster isn't
-completely dead. However, the are not enough to satisfy user's needs in most
+completely dead. However, they are not enough to satisfy user's needs in most
 of the cases.
 
 We are looking into extending the set of SLIs/SLOs to cover more parts of