docs: Fix grammatical errors in glossary (#10751)

website/content/docs/install/glossary.mdx

@@ -151,7 +151,7 @@ broader cloud-native community of cloud engineers.  Read more
 
 ## Custom Resource Definition (CRD) 	
 Custom resources are the extensions of the Kubernetes API.  A Custom Resource 
-Definition (CRD) file allows a user to define their own custom resources and 
+Definition (CRD) file allows users to define their own custom resources and 
 allows the API server to handle the lifecycle.
 
 ## Egress Traffic	
@@ -368,7 +368,7 @@ administrators to view their functions and interactions.
 
 ## Service-to-service communication	
 Service-to-service communication, sometimes referred to as 
-inter-service communication, if the ability of a microservice 
+inter-service communication, is the ability of a microservice 
 application instance to communicate with another to collaborate and 
 handle client requests.